Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 618,968	$ 992,584	$ 421,712
Cost of revenue	252,067	215,533	89,807
Gross profit	366,901	777,051	331,905
Operating expenses:
Research and development	28,910	24,219	11,580
Selling and marketing	38,918	24,439	14,952
General and administrative	111,074	50,732	15,215
Amortization of intangible assets	6,497	1,708
Restructuring costs	2,975
Total operating expenses	188,374	101,098	41,747
Operating (loss) income	178,527	675,953	290,158
Interest and other income, net	5,498	1,347	1,526
Income before income taxes and gain on equity method investment	184,025	677,300	291,684
Provision for income taxes	42,102	174,795	72,532
Income before gain on equity method investment	141,923	502,505	219,152
Equity loss in investee			(488)
Gain (loss) on equity-method investments		3,734	(4,354)
Net income from consolidated operations	141,923	506,239	214,310
Net loss attributable to noncontrolling interests	1,480	1,125
Net income attributable to Fulgent	$ 143,403	$ 507,364	$ 214,310
Net income per common share attributable to Fulgent:
Basic	$ 4.76	$ 17.25	$ 9.44
Diluted	$ 4.63	$ 16.38	$ 8.91
Weighted-average common shares:
Basic	30,097	29,408	22,694
Diluted	30,964	30,976	24,056