Business Combinations - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended								12 Months Ended
	Nov. 07, 2022	Apr. 26, 2022	Apr. 16, 2022	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill				$ 143,027				$ 50,897				$ 143,027	$ 50,897
Revenue				67,704	$ 105,655	$ 125,341	$ 320,268	251,671	$ 227,868	$ 153,616	$ 359,429	618,968	992,584	$ 421,712
Operating income (loss)				(36,552)	$ 352	$ 12,794	$ 201,933	$ 150,860	$ 159,273	$ 98,898	$ 266,922	178,527	675,953	$ 290,158
Restricted cash				$ 5,000								$ 5,000
Customer Relationships
Business Acquisition [Line Items]
Estimated amortization life of identified intangible assets assumed												13 years
Laboratory Information System Platform
Business Acquisition [Line Items]
Estimated amortization life of identified intangible assets assumed												5 years
Trade Name
Business Acquisition [Line Items]
Estimated amortization life of identified intangible assets assumed												8 years
In-Place Lease Intangible Assets
Business Acquisition [Line Items]
Estimated amortization life of identified intangible assets assumed												5 years
Inform Diagnostics
Business Acquisition [Line Items]
Acquisition related transaction costs												$ 9,600
Total purchase price payable			$ 170,000
Goodwill		$ 71,845
Identifiable intangible assets		$ 57,060
Percentage of acquisition of outstanding equity		100.00%
Revenue		$ 83,600
Operating income (loss)		17,000
Other adjustments related to net income												772,000	2,300
Other adjustments related to revenue												962,000	$ 3,900
Inform Diagnostics | Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets		$ 54,000
Estimated amortization life of identified intangible assets assumed		14 years
Inform Diagnostics | Trade Name
Business Acquisition [Line Items]
Identifiable intangible assets		$ 2,700
Estimated amortization life of identified intangible assets assumed		7 years
Inform Diagnostics | In-Place Lease Intangible Assets
Business Acquisition [Line Items]
Identifiable intangible assets		$ 360,000
Estimated amortization life of identified intangible assets assumed		5 years
Fulgent Pharma Holdings
Business Acquisition [Line Items]
Total purchase price payable	$ 68,035
Goodwill	22,055
Identifiable intangible assets	$ 64,590
Percentage of acquisition of outstanding equity	100.00%
Revenue	$ 0
Operating income (loss)	816,000
Restricted cash	$ 5,000
Fulgent Pharma Holdings | Restricted Stock Units
Business Acquisition [Line Items]
Restricted stock units vesting period	4 years
Selling, General and Administrative Expenses | Inform Diagnostics
Business Acquisition [Line Items]
Acquisition related transaction costs												6,600
Selling, General and Administrative Expenses | Fulgent Pharma Holdings
Business Acquisition [Line Items]
Acquisition related transaction costs												$ 1,400
Research and Development | Fulgent Pharma Holdings
Business Acquisition [Line Items]
Identifiable intangible assets	$ 64,600