CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2020	$ 194,945	$ 4	$ 376,788	$ 22	$ (181,869)
Beginning balance, shares at Dec. 31, 2020		39,105,548
Proceeds from follow-on equity offering, net of offering costs	161,916		161,916
Proceeds from follow-on equity offering, net of offering costs, shares		4,542,500
Proceeds from exercise of stock options	1,935		1,935
Proceeds from exercise of stock options, shares		833,676
Proceeds from ESPP purchases	1,191		1,191
Proceeds from ESPP purchases, shares		57,001
Restricted stock units vested, shares		167,538
Stock-based compensation	10,346		10,346
Foreign currency translation adjustment	12			12
Unrealized gain (loss) on available-for-sale debt securities	(22)			(22)
Net loss	(45,027)				(45,027)
Ending balance at Sep. 30, 2021	325,296	$ 4	552,176	12	(226,896)
Ending balance, shares at Sep. 30, 2021		44,706,263
Beginning balance at Jun. 30, 2021	338,747	$ 4	547,951	18	(209,226)
Beginning balance, shares at Jun. 30, 2021		44,209,968
Proceeds from exercise of stock options	536		536
Proceeds from exercise of stock options, shares		448,738
Restricted stock units vested, shares		47,557
Stock-based compensation	3,689		3,689
Foreign currency translation adjustment	(9)			(9)
Unrealized gain (loss) on available-for-sale debt securities	3			3
Net loss	(17,670)				(17,670)
Ending balance at Sep. 30, 2021	325,296	$ 4	552,176	12	(226,896)
Ending balance, shares at Sep. 30, 2021		44,706,263
Beginning balance at Dec. 31, 2021	310,301	$ 4	557,558	(166)	(247,095)
Beginning balance, shares at Dec. 31, 2021		44,904,512
Proceeds from exercise of stock options	981	$ 1	980
Proceeds from exercise of stock options, shares		475,687
Proceeds from ESPP purchases	974		974
Proceeds from ESPP purchases, shares		204,775
Restricted stock units vested, shares		370,892
Stock-based compensation	13,646		13,646
Foreign currency translation adjustment	(417)			(417)
Unrealized gain (loss) on available-for-sale debt securities	(839)			(839)
Net loss	(82,247)				(82,247)
Ending balance at Sep. 30, 2022	242,399	$ 5	573,158	(1,422)	(329,342)
Ending balance, shares at Sep. 30, 2022		45,955,866
Beginning balance at Jun. 30, 2022	264,632	$ 5	568,741	(1,264)	(302,850)
Beginning balance, shares at Jun. 30, 2022		45,891,458
Proceeds from exercise of stock options	2		2
Proceeds from exercise of stock options, shares		643
Restricted stock units vested, shares		63,765
Stock-based compensation	4,415		4,415
Foreign currency translation adjustment	(215)			(215)
Unrealized gain (loss) on available-for-sale debt securities	57			57
Net loss	(26,492)				(26,492)
Ending balance at Sep. 30, 2022	$ 242,399	$ 5	$ 573,158	$ (1,422)	$ (329,342)
Ending balance, shares at Sep. 30, 2022		45,955,866