CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Balance at Dec. 31, 2020	$ 353,064	$ 7	$ 478,272	$ (112)	$ (125,103)
Balance, Shares at Dec. 31, 2020		61,931,255
Stock-based compensation	8,103		8,103
Issuance of common stock, upon vesting of restricted stock, Shares		519,839
Unrealized (loss) gain on available-for-sale securities	42			42
Foreign currency translation adjustment	83			83
Net loss	(30,923)				(30,923)
Balance at Mar. 31, 2021	330,369	$ 7	486,375	13	(156,026)
Balance, Shares at Mar. 31, 2021		62,451,094
Balance at Dec. 31, 2021	225,266	$ 7	522,479	(155)	(297,065)
Balance, Shares at Dec. 31, 2021		63,565,886
Stock-based compensation	10,467		10,467
Issuance of common stock, upon vesting of restricted stock, Shares		698,241
Unrealized (loss) gain on available-for-sale securities	(195)			(195)
Foreign currency translation adjustment	0
Net loss	(43,863)				(43,863)
Balance at Mar. 31, 2022	$ 191,675	$ 7	$ 532,946	$ (350)	$ (340,928)
Balance, Shares at Mar. 31, 2022		64,264,127