Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning Balance, Values at Dec. 31, 2020	$ 344,278	$ 38	$ 510,309	$ (77)	$ (165,992)
Beginning Balance, Shares at Dec. 31, 2020		38,157,618
Stock-based compensation	2,962		2,962
Stock option exercises	268		268
Stock option exercises, Shares		74,930
Foreign currency translation adjustment	(1)			(1)
Unrealized gain (loss) on available-for-sale securities	(25)			(25)
Net loss	(26,060)				(26,060)
Ending Balance, Values at Mar. 31, 2021	321,422	$ 38	513,539	(103)	(192,052)
Ending Balance, Shares at Mar. 31, 2021		38,232,548
Beginning Balance, Values at Dec. 31, 2020	344,278	$ 38	510,309	(77)	(165,992)
Beginning Balance, Shares at Dec. 31, 2020		38,157,618
Foreign currency translation adjustment	(2)
Unrealized gain (loss) on available-for-sale securities	14
Net loss	(57,354)
Ending Balance, Values at Jun. 30, 2021	295,335	$ 38	518,708	(65)	(223,346)
Ending Balance, Shares at Jun. 30, 2021		38,322,112
Beginning Balance, Values at Mar. 31, 2021	321,422	$ 38	513,539	(103)	(192,052)
Beginning Balance, Shares at Mar. 31, 2021		38,232,548
Stock-based compensation	4,517		4,517
Stock option exercises	534		534
Stock option exercises, Shares		82,805
Issuance of common stock per Employee Stock Purchase Plan	118		118
Issuance of common stock per Employee Stock Purchase Plan, Shares		6,759
Foreign currency translation adjustment	(1)			(1)
Unrealized gain (loss) on available-for-sale securities	39			39
Net loss	(31,294)				(31,294)
Ending Balance, Values at Jun. 30, 2021	295,335	$ 38	518,708	(65)	(223,346)
Ending Balance, Shares at Jun. 30, 2021		38,322,112
Beginning Balance, Values at Dec. 31, 2021	231,909	$ 39	528,365	(180)	(296,315)
Beginning Balance, Shares at Dec. 31, 2021		38,560,854
Stock-based compensation	4,252		4,252
Stock option exercises	19		19
Stock option exercises, Shares		2,711
Foreign currency translation adjustment	3			3
Unrealized gain (loss) on available-for-sale securities	(196)			(196)
Net loss	(35,373)				(35,373)
Ending Balance, Values at Mar. 31, 2022	200,614	$ 39	532,636	(373)	(331,688)
Ending Balance, Shares at Mar. 31, 2022		38,563,565
Beginning Balance, Values at Dec. 31, 2021	$ 231,909	$ 39	528,365	(180)	(296,315)
Beginning Balance, Shares at Dec. 31, 2021		38,560,854
Stock option exercises, Shares	2,711
Foreign currency translation adjustment	$ (3)
Unrealized gain (loss) on available-for-sale securities	(256)
Net loss	(72,510)
Ending Balance, Values at Jun. 30, 2022	168,044	$ 39	537,269	(439)	(368,825)
Ending Balance, Shares at Jun. 30, 2022		38,603,906
Beginning Balance, Values at Mar. 31, 2022	200,614	$ 39	532,636	(373)	(331,688)
Beginning Balance, Shares at Mar. 31, 2022		38,563,565
Stock-based compensation	4,520		4,520
Issuance of common stock per Employee Stock Purchase Plan	113		113
Issuance of common stock per Employee Stock Purchase Plan, Shares		40,341
Foreign currency translation adjustment	(6)			(6)
Unrealized gain (loss) on available-for-sale securities	(60)			(60)
Net loss	(37,137)				(37,137)
Ending Balance, Values at Jun. 30, 2022	$ 168,044	$ 39	$ 537,269	$ (439)	$ (368,825)
Ending Balance, Shares at Jun. 30, 2022		38,603,906