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Loss per Share - Reconciliation of Basic and Diluted Loss Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Net loss attributable to Fulgent	$ (29,530)	$ (18,957)	$ (54,356)	$ (30,487)
Weighted-average common shares—outstanding, basic	28,005	30,544	29,435	30,687
Weighted-average effect of dilutive securities:
Weighted-average common shares—outstanding, diluted	28,005	30,544	29,435	30,687
Loss per Share, basic	$ (1.05)	$ (0.62)	$ (1.85)	$ (0.99)
Loss per Share, diluted	$ (1.05)	$ (0.62)	$ (1.85)	$ (0.99)

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