Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 227,868	$ 101,716	$ 740,913	$ 126,734
Cost of revenue	43,466	26,261	153,399	38,035
Gross profit	184,402	75,455	587,514	88,699
Operating expenses:
Research and development	6,021	3,177	16,755	7,004
Selling and marketing	6,012	5,014	16,239	9,871
General and administrative	12,299	3,741	28,630	7,575
Amortization of acquisition-related intangible assets	797		797
Total operating expenses	25,129	11,932	62,421	24,450
Operating income	159,273	63,523	525,093	64,249
Interest and other income, net	496	421	1,382	937
Income before income taxes, gain (loss) on equity method investments and equity loss in investee	159,769	63,944	526,475	65,186
Provision for income taxes	37,545	14,526	127,647	13,961
Income before gain (loss) on equity method investments and equity loss in investee	122,224	49,418	398,828	51,225
Gain (loss) on equity-method investments		(2,591)	3,734	(2,591)
Equity loss in investee		(189)		(631)
Net income from consolidated operations	122,224	46,638	402,562	48,003
Net loss attributable to noncontrolling interests	298		463
Net income attributable to Fulgent	$ 122,522	$ 46,638	$ 403,025	$ 48,003
Net income per common share attributable to Fulgent:
Basic	$ 4.13	$ 2.11	$ 13.79	$ 2.20
Diluted	$ 3.93	$ 1.98	$ 13.04	$ 2.07
Weighted-average common shares:
Basic	29,673	22,062	29,221	21,793
Diluted	31,170	23,539	30,906	23,135