Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenue	$ 289,213	$ 618,968	$ 992,584
Cost of revenue	184,757	252,067	215,533
Gross profit	104,456	366,901	777,051
Operating expenses:
Research and development	41,440	28,910	24,219
Selling and marketing	41,467	38,918	24,439
General and administrative	88,999	111,074	50,732
Amortization of intangible assets	7,845	6,497	1,708
Goodwill impairment loss	120,234
Restructuring costs		2,975
Total operating expenses	299,985	188,374	101,098
Operating (loss) income	(195,529)	178,527	675,953
Interest and other income, net	21,444	5,498	1,347
(Loss) income before income taxes and gain on equity-method investments	(174,085)	184,025	677,300
Provision for income taxes	1,154	42,102	174,795
(Loss) income before gain on equity-method investments	(175,239)	141,923	502,505
Gain on equity-method investments			3,734
Net (loss) income from consolidated operations	(175,239)	141,923	506,239
Net loss attributable to noncontrolling interests	7,414	1,480	1,125
Net (loss) income attributable to Fulgent	$ (167,825)	$ 143,403	$ 507,364
Net (loss) income per common share attributable to Fulgent:
Basic	$ (5.63)	$ 4.76	$ 17.25
Diluted	$ (5.63)	$ 4.63	$ 16.38
Weighted-average common shares:
Basic	29,784	30,097	29,408
Diluted	29,784	30,964	30,976