Entity Address, City or Town Entity Address, City or Town Stock Repurchased During Period, Value Aggregate cost of shares repurchased Repurchase of common stock Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Payment for purchase of redeemable preferred stock. Payment For Purchase Of Redeemable Preferred Stock Purchase of redeemable preferred stock Entity Ex Transition Period Entity Ex Transition Period Fair Value Disclosures [Abstract] Earnings Per Share [Abstract] Net (loss) income per common share attributable to Fulgent: Level 1 Fair Value, Inputs, Level 1 [Member] Schedule Of Available For Sale And Trading Securities [Table] Schedule Of Available For Sale And Trading Securities [Table] Schedule of available-for-sale and trading securities. Schedule Of Available For Sale And Trading Securities [Line Items] Schedule Of Available For Sale And Trading Securities [Line Items] Schedule of available-for-sale and trading securities. Finance Lease, Liability, to be Paid, Year Three 2026 Issuance of common stock Stock Issued During Period, Value, New Issues Recorded Unconditional Purchase Obligation by Category of Item Purchased Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Cash flow from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Amendment Flag Amendment Flag Debt Commitments And Contingencies Disclosure [Abstract] Debt, commitments and contingencies disclosure. Selling and Marketing Selling and Marketing Expense [Member] Subsequent Event Type [Domain] Equity and debt securities, Unrealized Gains Available For Sale Securities Debt Equity Securities And Trading Securities Unrealized Gain Before Tax Available for sale securities debt, equity securities and trading securities unrealized gain before tax. Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Cost of Revenue Cost of Sales [Member] Bond Funds Bonds [Member] Percentage of accounts receivable from contract. Percentage Of Accounts Receivable From Contract Percentage of net accounts receivable from contract Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total Goodwill Goodwill Operating lease ROU asset, net Operating Lease, Right-of-Use Asset Clinical Institutional Customers Contracts Clinical Institutional customers Contracts [Member] Clinical institutional customers contracts. Notes payable, noncurrent portion Notes Payable, Noncurrent Notes Payable, Noncurrent, Total Document Quarterly Report Document Quarterly Report 2025 Lessor, Operating Lease, Payment to be Received, Year Three Payments for Repurchase of Common Stock Repurchase of common stock HSRA COVID-19 Uninsured Program Health Resources And Services Administration COVID Nineteen Uninsured Program [Member] Health resources and services administration COVID nineteen uninsured program. Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Redeemable preferred stock investment Redeemable Preferred Stock Investment Noncurrent Redeemable preferred stock investment noncurrent. Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Statement [Table] Statement [Table] Operating lease liabilities, long term Operating Lease, Liability, Noncurrent Finance Lease, Liability, to be Paid, Year One 2024 Schedule of Lease Income Operating Lease, Lease Income [Table Text Block] Interest on lease liabilities Finance Lease, Interest Expense Number of customers Number Of Customers Number of customers. Gain on equity method investment. Gain On Equity Method Investment Gain on equity method investment Gain on equity method investment Debt, Commitments and Contingencies [Line Items] Debt Commitments And Contingencies [Line Items] Debt, commitments and contingencies. Other Long-Term Liabilities Other Noncurrent Liabilities [Member] Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Business Acquisition Business Acquisition [Axis] PTJ Associates Inc P T J Associates Inc [Member] PTJ Associates Inc. Land Improvements Land Improvements [Member] Common stock shares not issued and holdback as partial security for indemnification obligations. Common Stock Shares Not Issued and Holdback as Partial Security for Indemnification Obligations Common stock shares not issued and holdback as partial security for indemnification obligations Type and Tier Identifier [Domain] Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Business Combination Disclosure [Text Block] Business Combinations ROU assets - finance Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Right Of Use Finance Assets Business combination recognized identifiable assets acquired and liabilities assumed right of use finance assets. Purchase of preferred stock of privately held company Purchase Of Preferred Stock Of Privately Held Company Purchase of preferred stock of privately held company. Operating lease right-of-use assets reduced due to lease modification and termination Operating Lease Right Of Use Assets Reduced Due To Lease Modification And Termination Operating lease right of use assets reduced due to lease modification and termination. Schedule of Maturity Analysis of Operating and Finance Lease Liabilities using Undiscounted Cash Flows on an Annual Basis Lessee Operating And Finance Lease Liability Maturity Table [Text Block] Lessee operating and finance lease liability maturity. Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Options Share-Based Payment Arrangement, Option [Member] Concentration Risk Type Concentration Risk Type [Axis] Weighted average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Total liabilities and stockholders’ equity Liabilities and Equity Trade accounts receivable, net from related parties Accounts Receivable, Related Parties Total Other current liabilities Other Liabilities, Current Accumulated impairment losses Accumulated Impairment Losses Accumulated Impairment Losses Goodwill, Impaired, Accumulated Impairment Loss ANP technologies incorporation. ANP Technologies Incorporation [Member] ANP Technologies, Inc., Foreign currency translation loss Foreign currency translation (loss) gain Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income Statement [Abstract] Foreign Non-US [Member] Re-payment of notes payable Repayment of notes payable. Repayment Of Notes Payable Finance Lease, Weighted Average Remaining Lease Term Weighted average remaining lease term - finance lease Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Other liabilities Other long-term liabilities Other long-term liabilities Business acquisition, other adjustments related to net income. Business Acquisition, Other Adjustments Related to Net Income Other adjustments related to net income Finance lease liabilities, short term Finance Lease, Liability, Current Total current liabilities Liabilities, Current Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Lessee, Operating Lease, Liability, to be Paid, Year Three 2026 Comprehensive loss (gain) attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Fair Value Measurements Recurring Fair Value, Recurring [Member] Interest Expense, Total Interest expense Interest Expense Accounts Receivable, Allowance for Credit Loss, Ending Balance Accounts Receivable, Allowance for Credit Loss, Beginning Balance Allowance for credit losses Accounts Receivable, Allowance for Credit Loss Provision for credit losses for trade accounts receivable Trade Name Trade Names [Member] Short-term lease cost Short-Term Lease, Cost Hanlin Gao Chief Scientific Officer [Member] Chief Scientific Officer [Member] Schedule Of Trading Securities And Other Trading Assets [Line Items] Debt and Equity Securities, FV-NI [Line Items] Preferred stock, shares authorized Preferred Stock, Shares Authorized Other Noncurrent Assets [Member] Other Long-Term Assets Other Receivables, Net, Current, Total Other receivable Other Receivables, Net, Current Paul Kim Chief Financial Officer [Member] Less: Cash equivalents, Fair Value Less: Cash equivalents, FairValue Cash Equivalents Cash equivalents. Cumulative Effect, Period of Adoption Cumulative Effect, Period of Adoption [Axis] Weighted average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Investment, Name [Domain] Investment Secondary Categorization Investment Secondary Categorization [Axis] Entity Small Business Entity Small Business Royalty-Free Technology Royalty Free Technology [Member] Royalty-free technology. Number of reporting segments Number of Reportable Segments Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Summary of Revenue by Geographic Region Revenue from External Customers by Geographic Areas [Table Text Block] Clinical Institutional Contracts Clinical Institutional Contracts [Member] Clinical institutional contracts. Investments Investments [Domain] Summary of Annual Amortization Expense For Acquisition-Related Intangibles Finite-Lived Intangible Assets Amortization Expense [Table Text Block] Equity and debt securities, Unrealized Losses Available For Sale Securities Debt Equity Securities And Trading Securities Unrealized Loss Before Tax Available for sale securities debt, equity securities and trading securities unrealized loss before tax. Agency Securities [Member] U.S. Agency Debt Securities Customer Two Customer Two [Member] Customer two. Total current assets Assets, Current Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] 2023 (remaining 6 months) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average common shares—outstanding, basic Basic Weighted Average Number of Shares Outstanding, Basic Finance Lease, Liability, Total Total Finance Lease, Liability City Area Code City Area Code Overview and Basis of Presentation Business Description and Basis of Presentation [Text Block] Share-Based Payment Arrangement [Abstract] Total liabilities Liabilities Document Period End Date Document Period End Date Equity Distribution Agreement Equity Distribution Agreements Disclosure [Text Block] Equity distribution agreements disclosure. Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Insurance Customer Insurance Customer [Member] Insurance customer. Debt securities, Amortized Cost Basis Debt Securities, Available-for-Sale, Amortized Cost Finite-Lived Intangible Asset, Expected Amortization, Year One 2024 Statistical Measurement Statistical Measurement [Axis] Margin Account Borrowing Margin Account Borrowing [Member] Margin account borrowing. Total Other current assets Other Assets, Current Summaries of Goodwill and Acquisitions-Related Intangibles Balances Schedule of Intangible Assets and Goodwill [Table Text Block] Subsequent Event [Line Items] Interest on loan withdrawn from margin account Debt Instrument Interest Rate At Beginning Of Period Debt Instrument Interest Rate at Beginning of Period. Restructuring Costs, Total Restructuring Costs Restructuring Costs Restructuring costs Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Total Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Related Party Related Party [Axis] Total assets Assets Computer Software Software Development [Member] RSU assumed Business Combination Number Of Shares Assumed Business combination number of shares assumed. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Anti-dilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share Debt Securities Due After Five Years Through Ten Years [Member] Debt securities due after five years through ten years. Debt Securities due After 5 Year through 10 Years Entity Address, Postal Zip Code Entity Address, Postal Zip Code Document Fiscal Period Focus Document Fiscal Period Focus Long Term Equity Securities Long Term Equity Securities [Member] Long Term Equity Securities [Member] Trade accounts receivable Increase (Decrease) in Accounts Receivable Preferred stock, $0.0001 par value per share, 1,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Operating Lease, Liability, Total Total Operating Lease, Liability Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Notes Payable, Total Notes payable Notes Payable Contingent consideration payout related to a business acquisition Payment for Contingent Consideration Liability, Investing Activities Investment Income, Amortization of Premium Amortization of (discount) premium of marketable securities Statement of Financial Position [Abstract] FF Gene Biotech F F Gene Biotech [Member] FF Gene Biotech Member. Entity File Number Entity File Number Total lease payments Finance Lease, Liability, to be Paid Statement of Cash Flows [Abstract] Marketable securities Available For Sale Securities Debt Equity Securities And Trading Securities Current Available for sale securities debt equity securities and trading securities current. Balance Sheet Related Disclosures [Abstract] Noncontrolling Interest, Increase from Business Combination Noncontrolling interest assumed related to acquisitions Debt, Commitments and Contingencies Debt Commitments And Contingencies Disclosure [Text Block] Debt, commitments and contingencies disclosure. Borrowing under margin account Proceeds from Issuance of Debt Geographical Geographical [Domain] Statistical Measurement Statistical Measurement [Domain] Statement of Stockholders' Equity [Abstract] Notes payable, current portion Notes Payable, Current Notes Payable, Current, Total Revenue Revenue Benchmark [Member] Revenue from Contracts with Customers Revenue from Contract with Customer [Policy Text Block] Lease, Cost [Table Text Block] Schedule of Operating and Finance Lease Expenses Stockholders' Equity Note [Abstract] Equity Method Investment, Ownership Percentage Ownership percentage Subsequent Events [Abstract] Investment in private equity securities Payments to Acquire Equity Securities, FV-NI Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Proceeds from public offerings of common stock, net of issuance costs Proceeds from Issuance of Common Stock Deferred Income Tax Expense (Benefit), Total Deferred taxes Deferred Income Tax Expense (Benefit) Leases Lessor And Lessee Operating And Finance Leases [Text Block] Lessor and lessee operating and finance leases. Clinical Insurance Contracts Clinical Insurance Contracts [Member] Clinical insurance contracts. Contingent consideration for business acquisition included in other current liabilities Noncash Or Part Noncash Contingent Consideration For Business Acquisition Included In Current Liabilities Noncash or part noncash contingent consideration for business acquisition included in current liabilities Major Classes of Fixed Assets Property, Plant and Equipment [Table Text Block] Prepaid income taxes Prepaid Taxes Concentration of Customers Concentration Risk, Credit Risk, Policy [Policy Text Block] Goodwill And Intangible Assets [Table] Goodwill And Intangible Assets [Table] Goodwill and intangible assets. Expenses to transport employees and supplies Related Party Transaction, Expenses from Transactions with Related Party US Government Debt Securities [Member] U.S. Government Debt Securities Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Contract liability Contract liabilities Contract with Customer, Liability, Current 2023 (remaining 6 months) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Debt securities, Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax U.S. government debt securities Unrecognized tax benefits Unrecognized Tax Benefits Operating Activities Unrecognized tax benefits operating activities. Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Reagents and Other Supplies Reagents And Other Supplies [Member] Reagents and other supplies. Credit Facility Credit Facility [Domain] Subsequent Events Subsequent Events [Text Block] Xilong Scientific Xilong Scientific [Member] Xilong Scientific Member. General Equipment General Equipment [Member] General equipment. Weighted Average Number of Shares Outstanding, Diluted, Total Weighted-average common shares—outstanding, diluted Diluted Weighted Average Number of Shares Outstanding, Diluted Fair value assets, transfers between levels, amount Fair Value Assets Transfers Between Levels Amount Fair value assets, transfers between levels, amount. Laboratory Information System Platform Laboratory Information System Platform [Member] Laboratory information system platform. Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Credit Facility Credit Facility [Axis] Corporate Debt Securities Corporate Debt Securities [Member] Business Acquisition, Pro Forma Net Income (Loss) Net income attributable to Fulgent Computer Hardware Computer Equipment [Member] General and Administrative General and Administrative Expense [Member] Current Fiscal Year End Date Current Fiscal Year End Date Related party costs Related Party Costs Investment Type Investment Type [Axis] Inform Diagnostics. Inform Diagnostics [Member] Inform Diagnostics Depreciation, Total Depreciation expense on fixed assets Depreciation Financial Instruments [Domain] Stock Repurchased During Period, Shares Number of shares repurchased Repurchase of common stock, Shares Other Assets, Noncurrent, Total Other long-term assets Other Assets, Noncurrent Total stockholders’ equity Beginning Balance Ending Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Investment Income, Net, Amortization of Discount and Premium, Total Investment Income, Net, Amortization of Discount and Premium Amortization of (discount) premium of marketable securities Entity Address, Address Line One Entity Address, Address Line One Finance Leases Term Of Expiration Finance Leases Term Of Expiration Finance leases term of expiration Purchases of fixed assets in notes payable Noncash Or Part Noncash Purchase of Fixed Assets in Notes Payable Noncash or part noncash purchase of fixed assets in notes payable. Noncontrolling Interest Noncontrolling Interest [Member] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Short-Term Equity Securities Short Term Equity Securities [Member] Short term equity securities. Redeemable Preferred Stock Investment Redeemable Preferred Stock Investment Policy [Text Block] Redeemable preferred stock investment. Income Tax Expense (Benefit), Total Income Tax Expense (Benefit) (Benefit from) provision for income taxes Exchange Traded Funds Exchange Traded Funds [Member] Operating lease liabilities Increase (Decrease) in Operating Lease Liability Operating lease liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Liabilities Business combination recognized identifiable assets acquired and liabilities assumed operating lease liabilities. Finance Lease Finance Lease, Liability, to be Paid [Abstract] Income Taxes Income Tax Disclosure [Text Block] Business acquisition measurement period. Business Acquisition Measurement Period Business acquisition measurement period from acquisition date Preferred Stock, Shares Issued, Total Preferred stock, shares issued Preferred Stock, Shares Issued Balance Sheet Location Balance Sheet Location [Domain] Payments to Acquire Property, Plant, and Equipment, Total Purchases of fixed assets Payments to Acquire Property, Plant, and Equipment Income Tax Disclosure [Abstract] Research Development Service Research Development Service [Member] Research development service. US Treasury Bill Securities [Member] U.S. Treasury Bills Issuance of common stock, Shares Stock Issued During Period, Shares, New Issues Building Improvements Building Improvements [Member] Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Restricted stock awards Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Accounts payable to related parties Accounts Payable, Related Parties Weighted average common shares. Weighted Average Common Shares [Abstract] Weighted-average common shares: Variable lease income Operating Lease, Variable Lease Income Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Lessor, Operating Lease, Payment to be Received, Year One 2024 Equity [Abstract] Finance Lease, Liability, to be Paid, Year Four 2027 Contract with customer liability, revenue recognized Contract with Customer, Liability, Revenue Recognized Operating Income (Loss) Operating income (loss) Operating (loss) income Building Building [Member] Related Party Related Party [Domain] Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Additional Paid in Capital, Common Stock AHMC Healthcare Inc. A H M C Healthcare Inc [Member] AHMC healthcare Inc. Payments to Acquire Businesses, Net of Cash Acquired, Total Acquisition of businesses, net of cash acquired Cash, net of cash received Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Entity Filer Category Entity Filer Category Payments to Acquire Marketable Securities, Total Purchase of marketable securities Payments to Acquire Marketable Securities Proceeds from Sale and Maturity of Marketable Securities, Total Maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies [Line Items] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Fixed assets Total operating expenses Operating Expenses Entity Current Reporting Status Entity Current Reporting Status Goodwill, Foreign Currency Translation Gain (Loss) Net foreign currency exchange differences Asset Class Asset Class [Domain] Share-Based Payment Arrangement, Noncash Expense [Abstract] Common stock withholding for employee tax obligations, Shares Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Stockholders' Equity Note Disclosure [Text Block] Stock Repurchase Program Business Combinations [Abstract] Intangible assets, net Finite-Lived Intangible Assets, Net, Ending Balance Finite-Lived Intangible Assets, Net, Beginning Balance Acquisitions-related intangibles, net Finite-Lived Intangible Assets, Net Lease income Operating Lease, Lease Income, Lease Payments Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total Fulgent stockholders' equity Stockholders' Equity Attributable to Parent Accumulated Other Comprehensive (Loss) AOCI Attributable to Parent [Member] Purchases of fixed assets in accounts payable Noncash or Part Noncash Acquisition, Fixed Assets Acquired Asset Class Asset Class [Axis] Entity Tax Identification Number Entity Tax Identification Number Reagents and supplies Reagents And Supplies Current Reagents and supplies current. Income Statement Location Income Statement Location [Axis] Common stock, $0.0001 par value per share, 50,000 shares authorized, 31,728 and 31,248 shares issued, respectively, and 29,917 and 29,438 shares outstanding, respectively Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common Stock, Value, Issued RSU assumed, value Business Combination Value Of Shares Assumed Business combination, value of shares assumed. Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption Cumulative Effect, Period of Adoption [Domain] Equity Components Equity Components [Axis] Business Combination, Acquisition Related Costs Acquisition related transaction costs Accounting Standards Update Accounting Standards Update [Domain] Foreign currency remeasurements loss Income Losses From Re Measurements Of Foreign Currency Translation And Foreign Currency Transactions Income losses from re measurements of foreign currency translation and foreign currency transactions. Customer Deposit Customer Deposit Policy [Text Block] Customer deposit. Prepaid Expense, Current, Total Prepaid expenses Prepaid Expense, Current Leases [Abstract] Customer Relationships Customer Relationships [Member] Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share based compensation allocation of recognized period costs. Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction Related Party Transaction [Axis] Schedule of Business Acquisitions, by Acquisition [Table] Operating expenses: Operating Expenses [Abstract] Other Current Assets [Text Block] Other Significant Balance Sheet Accounts Diluted Income (Loss) from Continuing Operations, Per Diluted Share Net income (loss) per common share, diluted Customer one. Customer One [Member] Customer One Foreign currency translation loss (gain) attributable to noncontrolling interest Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Cost of Revenue, Total Cost of revenue Cost of Revenue Marketable Securities, Gain (Loss) Net loss on marketable securities Unconditional Purchase Obligation, Category of Goods or Services Acquired Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Operating Leases Lessee, Operating Lease, Liability, to be Paid [Abstract] Selling and Marketing Expense, Total Selling and marketing Selling and Marketing Expense Investment, Name [Axis] Debt instrument, interest rate terms Debt Instrument, Description Document Transition Report Document Transition Report Total equity securities, debt securities and cash equivalents Total equity securities, debt securities and cash equivalents Assets, Fair Value Disclosure Depreciation, Depletion and Amortization, Total Depreciation and amortization Depreciation, Depletion and Amortization Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Restricted stock awards, Shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Selling price per share Sale of Stock, Price Per Share Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Trade accounts receivable, net of allowance for credit losses of $33,173 and $41,205 Accounts Receivable, after Allowance for Credit Loss, Current, Total Receivables from contract with customers Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Future Fixed Lease Payments from Tenants for All Noncancelable Operating Leases Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block] Unrealized gains or losses Unrealized holding gains Debt Securities, Available-for-Sale, Unrealized Gain (Loss) Debt Securities, Available-for-sale, Unrealized Gain (Loss), Total Unrealized gain (loss) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Purchased Patent Purchased Patent [Member] Purchased patent. Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Total Other Comprehensive Income (Loss), Net of Tax Other comprehensive gain (loss) Other comprehensive income (loss) Investment in Private Equity Securities Private Equity Funds Private Equity Funds [Member] Net Income (Loss) Attributable to Parent Net income (loss) attributable to Fulgent Net (loss) income attributable to Fulgent Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Jian Xie President And Chief Operating Officer [Member] President And Chief Operating Officer [Member] Operating lease liabilities, short term Operating Lease, Liability, Current Security Owned and Sold, Not yet Purchased, at Fair Value Security Owned and Sold, Not yet Purchased, at Fair Value [Axis] Additional Paid-In Capital Additional Paid-in Capital [Member] Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Preferred Stock Of Privately Held Company Preferred Stock Of Privately Held Company [Member] Preferred Stock Of Privately Held Company [Member] Common stock withholding for employee tax obligations Payment, Tax Withholding, Share-Based Payment Arrangement Payment, Tax Withholding, Share-Based Payment Arrangement, Total Taxes Payable, Current, Total Income tax payable Taxes Payable, Current Automobile Automobile [Member] Automobile. Non-cancelable purchase obligations, payable within twelve months Recorded Unconditional Purchase Obligation, Due in Next Rolling 12 Months Entity Registrant Name Entity Registrant Name Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Earnings Per Share [Text Block] Income (Loss) per Share Marketable and non-marketable securities, Unrealized Losses Equity Securities Fv Ni Accumulated Gross Unrealized Loss Before Tax Equity securities fv ni accumulated gross unrealized loss before tax. Clinical Patients Contracts Clinical Patients Contracts [Member] Clinical patients contracts. Lessee Lease Description [Table] Lessee, Lease, Description [Table] Share-based Payment Arrangement, Noncash Expense, Total Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Statement of Comprehensive Income [Abstract] Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Fixed assets, net Fixed assets, net Property, Plant and Equipment, Net Amortization of ROU assets Finance Lease, Right-of-Use Asset, Amortization Award Type Award Type [Domain] Statement [Line Items] Statement [Line Items] 2023 (remaining 6 months) Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year ANP technologies inc [Member]. A N P Technologies Inc [Member] ANP Technologies Inc Title of 12(b) Security Title of 12(b) Security Finite-Lived Intangible Assets, Gross, Total Acquisitions-related intangibles, gross Finite-Lived Intangible Assets, Gross Payable balance. payable balance Restructuring costs, payable balance Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Accounts Payable Ownership [Domain] Stockholders' Equity Common Stock Common Stock [Member] Cash flow from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Equity Component Equity Component [Domain] 2023 (remaining 6 months) Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Insurance revenue for services related to claims Revenue from Contract with Customer, Excluding Assessed Tax, Total Revenue from contracts with customers by payor type Revenue Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Loss) income before income taxes Less imputed interest Finance Lease, Liability, Undiscounted Excess Amount Entity Address, State or Province Entity Address, State or Province Related Party Transaction, Purchases from Related Party Purchase of COVID-19 antigen rapid tests kits from related party Lessee, Operating Lease, Liability, to be Paid, Year Four 2027 November 2020 Equity Distribution Agreement November Two Thousand Twenty Equity Distribution Agreement [Member] November two thousand twenty equity distribution agreement. Geographical Geographical [Axis] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Net decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Comprehensive (loss) income from consolidated operations Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Interest Paid Interest Paid, Excluding Capitalized Interest, Operating Activities Business Acquisition, Pro Forma Information [Table Text Block] Summary of Unaudited Pro Forma Financial Information Proceeds from sale of marketable securities Proceeds From Sale Of Marketable Securities Proceeds from maturity of marketable securities. Institutional Customer Institutional Customer [Member] Institutional customer. United States UNITED STATES Largest customer deposit Larget Customer Deposit Larget customer deposit. Redeemable Preferred Stock Investment Redeemable Preferred Stock [Member] Trade Accounts Receivable and Allowance for Credit Losses Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Other employees Other Employee [Member] Other Employee [Member] Total Equity-based compensation expense Share-Based Payment Arrangement, Expense Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Investment in private securities unobservable input Total equity trading securities Marketable and non-marketable securities, Aggregate Fair Value Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Debt Securities Debt Securities [Member] Debt Commitments And Contingencies [Table] Debt Commitments And Contingencies [Table] Debt, commitments and contingencies. Stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Security Exchange Name Security Exchange Name Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Finance lease liabilities, long term Finance Lease, Liability, Noncurrent Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Outstanding borrowing amount Investment margin loan Investment Margin Liabilities Current Investment margin liabilities current. Debt instrument, interest rate Debt Instrument, Interest Rate, Effective Percentage Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Deferred tax assets Cash consideration Payments to Acquire Businesses, Gross Consultants Consultants [Member] Consultants. Common stock withholding for employee tax obligations Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Finance lease liabilities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Finance Lease Liabilities Business combination recognized identifiable assets acquired and liabilities assumed finance lease liabilities. Operating lease cost Operating Lease, Cost Income before gain on equity method investment. Income before gain on equity method investment Income before gain on equity method investment Restricted Stock Units Restricted Stock Units (RSUs) [Member] Finance Lease, Liability, to be Paid, Year Two 2025 Business Acquisition, Pro Forma Revenue Revenue Operating leases term of expiration Operating Leases Term Of Expiration Operating leases term of expiration. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Identified intangible assets Intangibles attributable to acquisition Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Business Acquisition [Line Items] Level 2 Fair Value, Inputs, Level 2 [Member] Redeemable preferred stock investment unobservable Debt Securities, Available-for-sale, Total Total debt securities Debt securities, Aggregate Fair Value Cash flow from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Share Based Compensation Allocation Of Recognized Period Costs [Table] Share Based Compensation Allocation Of Recognized Period Costs [Table] Share based compensation allocation of recognized period costs. Summary of Equity and Debt Securities Schedule Of Available For Sale Debt Securities And Equity Trading Securities Reconciliation Table [Text Block] Schedule of available for sale debt securities and equity/trading securities reconciliation. Commitments and contingencies (Note 8) Commitments and Contingencies Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Recognized amounts of identifiable assets acquired and liabilities assumed, net Common Stock, Shares, Issued, Total Common stock, shares issued Beginning Balance, Shares Ending Balance, Shares Common Stock, Shares, Issued Income tax payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Due to Related Parties, Current, Total Due to related parties Due to Related Parties, Current Tax effects related to unrealized holding loss on available-for-sale debt securities Tax Effects Related To Unrealized Holding Loss On Available For Sale Debt Securities Tax effects related to unrealized holding loss on available for sale debt securities. Short-Term Marketable Securities Short Term Marketable Securites [Member] Short-term marketable securites. Minimum Minimum Minimum [Member] Cash equivalents, Unrealized Gains Cash Equivalents Unrealized Gains Cash equivalents unrealized gains. Accounting Standards Update Accounting Standards Update [Axis] Accrued liabilities Accrued Liabilities, Current Accrued Liabilities, Current, Total Debt Instrument Debt Instrument [Axis] Cumulative tax effect of accounting change Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle Computer Software, Intangible Asset [Member] Internal Use Software Remaining terms including renewal options Lessor Operating Lease Remaining Term Of Contract Including Renewal Options Lessor, operating lease, remaining term of contract including renewal options. Foreign Currency Translation and Foreign Currency Transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Business Acquisition, Pro Forma Earnings Per Share, Diluted Diluted earnings per common share attributable to Fulgent Amortization of intangible assets Amortization of Intangible Assets, Total Amortization of Intangible Assets Award Type Award Type [Axis] Other Noncash Income (Expense), Total Other Other Noncash Income (Expense) Subsequent Event Subsequent Event [Member] Services. Services [Member] Services Business combination, consideration transferred Total purchase price payable Purchase price for effective investment Cash, net of cash received Additional costs expected to be incurred Restructuring and Related Cost, Expected Cost Restructuring and Related Cost, Expected Cost, Total Related Party Transaction Related Party Transaction [Domain] Schedule Of Supplemental Information Related To Leases Table [Text Block] Schedule of supplemental information related to leases. Schedule of Supplemental Information Related to Operating and Finance Leases Research and Development Expense, Total Research and development Research and Development Expense Total lease payments Lessee, Operating Lease, Liability, to be Paid Schedule of Operating and Finance Lease Right-of-Use Asset, Short-term Lease Liabilities, and Long-term Lease Liabilities Schedule Of Lease Right Of Use Asset Short Term Lease Liabilities And Long Term Lease Liabilities Table [Text Block] Schedule of lease right-of-use asset, short-term lease liabilities, and long-term lease liabilities. Marketable and non-marketable securities, Amortized Cost Basis Equity Securities, FV-NI, Cost Entity Central Index Key Entity Central Index Key Gross unrealized loss Available For Sale Debt Securities And Equity Trading Securities Gross Unrealized Loss Available for sale debt securities and equity/trading securities gross unrealized loss. Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finance lease right-of-use assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Customer Customer [Axis] Accounting Policies [Abstract] Accrued liabilities and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Ming Hsieh, the Chief Executive Officer and Chairman Ming Hsieh, the Chief Executive Officer and Chairman [Member] Ming Hsieh, the Chief Executive Officer and Chairman. Investments, Debt and Equity Securities [Abstract] Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total Finance lease ROU asset, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Equity and debt securities, Amortized Cost Basis Available For Sale Securities Debt Equity Securities And Trading Securities Amortized Cost Basis Available for sale securities debt, equity securities and trading securities amortized cost basis. Weighted average discount rate - finance lease Finance Lease, Weighted Average Discount Rate, Percent Measurement Frequency Measurement Frequency [Axis] Repayment of investment margin loan Repayment of investment margin loan Repayment Of Investment Margin Loan Repayment of investment margin loan. Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Total lease income Lease income Operating Lease, Lease Income Contingent consideration Business Combination, Contingent Consideration, Liability, Current Subsequent Event [Table] General and Administrative Expense, Total General and administrative General and Administrative Expense Installment Sale Contract Instalment Sale Contract. Organization, Consolidation and Presentation of Financial Statements [Abstract] Principal paid for finance lease Finance Lease, Principal Payments Research and Development Research and Development Expense [Member] Total lease cost Lease, Cost Operating lease right-of-use assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Investments by Secondary Categorization Investments by Secondary Categorization [Domain] Retained Earnings Retained Earnings [Member] Customer Customer [Domain] Money Market Accounts Money Market Funds [Member] Segment Reporting [Abstract] Customer deposit Customer Deposit Customer deposit. Effective Income Tax Rate Reconciliation, Percent, Total Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Stock consideration Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Fixed assets, gross Property, Plant and Equipment, Gross Goodwill acquired during year Goodwill, Acquired During Period Largest customer deposit Largest Customer Deposit Largest customer deposit. Business Acquisition, Pro Forma Earnings Per Share, Basic Basic earnings per common share attributable to Fulgent Entity Interactive Data Current Entity Interactive Data Current Accrued Liabilities Assembled workforce. Assembled Workforce [Member] Assembled Workforce Related Parties Related Party Transactions Disclosure [Text Block] Preferred stock, redemption date Preferred Stock, Redemption Date Related Party Transactions [Abstract] Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Lessee, Operating Lease, Liability, to be Paid, Year One 2024 Payable balance, expected paid off date Payable Balance Expected To Be Paid Off Date Payable balance expected to be paid off date. Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Provision for credit losses for trade accounts receivable Leasehold Improvements Leasehold Improvements [Member] Assets Not Yet Placed in Service Assets Not Yet Placed In Service [Member] Assets not yet placed in service. Local Phone Number Local Phone Number Unrecognized Tax Benefits, Ending Balance Unrecognized Tax Benefits, Beginning Balance Unrecognized tax benefits Unrecognized Tax Benefits Percentage of ownership Percentage of Share Owned by Related Party Percentage of share owned by related party. Information about Financial Assets Measured at Fair Value on Recurring Basis Based on Three-Tier Fair Value Hierarchy Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Summary of Consideration Paid and Amount of Assets Acquired and Liabilities Assumed Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Reconciliation of the Basic and Diluted Income (loss) Per Share Computations Fulgent Pharma Holdings Fulgent Pharma Holdings [Member] Fulgent Pharma Holdings. Restricted stock units vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Interest rate Debt Instrument Interest Rate At End Of Period Debt instrument interest rate at end of period. Net loss attributable to noncontrolling interest Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest 2024 Lessor, Operating Lease, Payment to be Received, Year Two Noncash or part noncash public offering costs included in accounts payable. Noncash Or Part Noncash Public Offering Costs Included In Accounts Payable Public offerings costs included in accounts payable Municipal Bonds Municipal Bonds [Member] Summary of Revenue from Contracts with Customers by Payor Type Disaggregation of Revenue [Table Text Block] Recorded Unconditional Purchase Obligation, Due in Rolling Year Three Non-cancelable purchase obligations, payable within next thirty-six months Other Liabilities, Noncurrent, Total Other long-term liabilities Other Liabilities, Noncurrent Payments for closing of escrow, financed under margin loan Payments For Closing Of Escrow Financed Under Margin Loan Payments for closing of escrow, financed under margin loan. Income Statement Location Income Statement Location [Domain] Marketable securities interest receivable Marketable Securities Interest Receivable Current Marketable securities interest receivable current. Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses Property, Plant and Equipment [Abstract] Customer Concentration Risk Customer Concentration Risk [Member] Debt Instrument, Name Debt Instrument, Name [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Total intangible assets, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Purchase Obligation, Total Non-cancelable purchase obligations Purchase Obligation Lessee, Operating Lease, Liability, to be Paid, Year Two 2025 Interest and Other Income, Total Interest and other income, net Interest and Other Income Income (Loss) from Continuing Operations, Per Outstanding Share, Total Basic Income (Loss) from Continuing Operations, Per Basic Share Net income (loss) per common share, basic Income taxes paid Income Taxes Paid Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Gross Assets Assets [Abstract] Long-term marketable securities. Long Term Marketable Securities [Member] Long-Term Marketable Securities Business acquisition, other adjustments related to revenue. Business acquisition, other Adjustments Related to Revenue. Other adjustments related to revenue Gross profit Gross Profit Proceeds from Noncontrolling Interests Proceeds from noncontrolling interest Fulgent Pharma LLC Fulgent Pharma Limited Liability Company [Member] Fulgent Pharma Limited Liability Company. Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Total Financial Instrument [Axis] Equity and debt securities, Aggregate Fair Value Available For Sale Securities Debt Equity Securities And Trading Securities Available for sale securities debt equity securities and trading securities. Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Business Acquisition, Percentage of Voting Interests Acquired Percentage of acquisition of outstanding equity Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Finite-Lived Intangible Assets [Member] Intangible Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Land Land [Member] Net (loss) income from consolidated operations Net income from consolidated operations Net income (loss) Net (loss) income from consolidated operations Current assets Assets, Current [Abstract] Finite-Lived Intangible Asset, Expected Amortization, Year Four 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two 2025 Business combination recognized identifiable assets acquired and liabilities assumed net working capital. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Working Capital Net working capital Net working capital Reporting Segment and Geographic Information Segment Reporting Disclosure [Text Block] Revenue from related parties Revenue from Related Parties Software. Software [Member] Software Marketable securities, long-term Debt Securities, Available-for-Sale, Noncurrent Summary of Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] In-place lease intangible assets. In-Place Lease Intangible Assets [Member] In-Place Lease Intangible Assets Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Measurement Frequency Measurement Frequency [Domain] Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Investments in Debt and Equity Instruments, Cash and Cash Equivalents, Unrealized and Realized Gains (Losses) [Text Block] Equity and Debt Securities Cover [Abstract] Concentration risk, percentage Concentration Risk, Percentage Finance lease cost: Finance Leases Cost [Abstract] Finance leases cost. Weighted-Average Amortization Period Estimated amortization life of identified intangible assets assumed Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Debt Securities Due After One Year Through Five Years [Member] Debt securities due after one year through five years. Debt Securities due After 1 Year through 5 Years U.S. Agency Debt Securities U S Agency Debt Securities [Member] U.S. agency debt securities. Current liabilities Liabilities, Current [Abstract] Genetic Sequencing Services Genetic Sequencing Service [Member] Genetic sequencing service. Yankee Debt Securities Yankee Debt Securities [Member] Yankee debt securities. Maximum Maximum [Member] Medical Lab Furniture Medical Lab Furniture [Member] Medical lab furniture. Lessee operating lease liability payments due after year four. Lessee Operating Lease Liability Payments Due After Year Four Thereafter Net (loss) gain on available-for-sale debt securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Summary of Equity-Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule Of Trading Securities And Other Trading Assets [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Furniture and Fixtures Furniture and Fixtures [Member] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Exercise of common stock options, Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Finance lease right-of-use assets reduced due to lease modification and termination Finance Lease Right-of-use Assets Reduced Due To Lease Modification And Termination Finance lease right-of-use assets reduced due to lease modification and termination. Percentage of net accounts receivable from contract. Percentage Of Net Accounts Receivable From Contract Percentage of net accounts receivable from contract Goodwill and Acquisition-Related Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Noncash lease expense Noncash Lease Expense Noncash lease expense. Use of Estimates Use of Estimates, Policy [Policy Text Block] Less: Cash equivalents, Carrying Value Cash Equivalents, at Carrying Value, Total Cash Equivalents, at Carrying Value Accounts Receivable Accounts Receivable [Member] Exercise of common stock options Stock Issued During Period, Value, Stock Options Exercised Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finite-Lived Intangible Asset, Expected Amortization, Year Five 2028 In-Process Research & Development In-Process Research & Development [Member] In-Process Research & Development ROU assets - operating Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Operating Lease Right Of Use Assets Business combination, recognized identifiable assets acquired and liabilities assumed, operating lease right-of-use assets. Useful life in years Property, Plant and Equipment, Useful Life Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock repurchase program, remaining authorized amount Security Owned and Sold, Not yet Purchased Fair Value, Security Name Security Owned and Sold, Not yet Purchased Fair Value, Security Name [Domain] Finite-Lived Intangible Asset, Expected Amortization, Year Three 2026 Common stock, shares authorized Common Stock, Shares Authorized Trading Symbol Trading Symbol Ownership [Axis] Fulgent Stockholders' Equity Parent [Member] Title of Individual [Domain] Subsequent Event Type [Axis] Balance Sheet Location Balance Sheet Location [Axis] Comprehensive (loss) income attributable to Fulgent Comprehensive Income (Loss), Net of Tax, Attributable to Parent Proceeds from Sale of Property, Plant, and Equipment, Total Proceeds from sale of fixed assets Proceeds from Sale of Property, Plant, and Equipment Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Total Lessor, Operating Lease, Payments to be Received Insurance Type and Tier Identifier [Axis] Debt securities, Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Increase (Decrease) in Other Operating Assets, Total Other current and long-term assets Increase (Decrease) in Other Operating Assets Business combination recognized identifiable assets acquired and liabilities assumed income tax payable. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Income Tax Payable Income tax payable Medical Lab Equipment Medical Lab Equipment [Member] Medical lab equipment. Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Title of Individual [Axis] Concentration Risk Type Concentration Risk Type [Domain] Debt security investment outstanding borrowing amount Debt Security Investment Outstanding Borrowing Amount Debt security investment outstanding borrowing amount. Director [Member] Ming Hsieh Goodwill And Intangible Assets [Line Items] Goodwill And Intangible Assets [Line Items] Goodwill and intangible assets. Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Contingently issuable shares. Contingently Issuable Shares [Member] Contingently Issuable Shares Common stock, par value Common Stock, Par or Stated Value Per Share Loss on disposal of fixed asset Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Non cash or part non cash Investment in marketable securities. Non Cash Or Part Non Cash Investment In Marketable Securities Purchases of marketable securities in other current liabilities Stock Repurchase Program, Authorized Amount Stock repurchase program, authorized amount Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Redeemable Preferred Stock Investment Redeemable Preferred Stock Investment [Member] Redeemable preferred stock investment. Aircraft Aircraft [Member] Aircraft. Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Fixed Assets Property, Plant and Equipment Disclosure [Text Block] Useful life in years Property, Plant and Equipment, Estimated Useful Lives Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Other assets Other long-term assets Anti-dilutive securities excluded from calculation of diluted income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Cash and cash equivalents fair value disclosure Cash and cash equivalents fair value disclosure Cash and Cash Equivalents, Fair Value Disclosure Supplemental disclosures of non-cash investing and financing activities: Noncash Investing and Financing Items [Abstract]