Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Accumulated deficit	Accumulated other comprehensive loss
Beginning balance at Dec. 31, 2020	$ 59,493		$ 222,949	$ (163,429)	$ (27)
Beginning balance (in shares) at Dec. 31, 2020		34,047,300
Net loss	(13,399)			(13,399)
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan	27		27
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan (in shares)		82,625
Share-based compensation expense related to issuance of stock options and RSUs to employees and employee stock purchase plan	1,921		1,921
Share‑based compensation expense related to issuance of stock options to non-employees	391		391
Ending balance at Mar. 31, 2021	48,433		225,288	(176,828)	(27)
Ending balance (in shares) at Mar. 31, 2021		34,129,925
Beginning balance at Dec. 31, 2020	59,493		222,949	(163,429)	(27)
Beginning balance (in shares) at Dec. 31, 2020		34,047,300
Net loss	(29,581)
Foreign currency translation adjustment (loss) gain	1
Ending balance at Jun. 30, 2021	65,222		258,258	(193,010)	(26)
Ending balance (in shares) at Jun. 30, 2021		43,275,249
Beginning balance at Mar. 31, 2021	48,433		225,288	(176,828)	(27)
Beginning balance (in shares) at Mar. 31, 2021		34,129,925
Net loss	(16,182)			(16,182)
Issuance of common stock equity private placement and ATM	30,497		30,497
Issuance of common stock equity private placement and ATM (in shares)		9,087,547
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan	133		133
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan (in shares)		57,777
Share-based compensation expense related to issuance of stock options and RSUs to employees and employee stock purchase plan	1,942		1,942
Share‑based compensation expense related to issuance of stock options to non-employees	398		398
Foreign currency translation adjustment (loss) gain	1
Ending balance at Jun. 30, 2021	65,222		258,258	(193,010)	(26)
Ending balance (in shares) at Jun. 30, 2021		43,275,249
Beginning balance at Dec. 31, 2021	$ 48,246		263,345	(215,076)	(23)
Beginning balance (in shares) at Dec. 31, 2021	43,410,185	43,410,185
Net loss	$ (12,978)			(12,978)
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan (in shares)		38,175
Share-based compensation expense related to issuance of stock options and RSUs to employees and employee stock purchase plan	1,476		1,476
Share‑based compensation expense related to issuance of stock options to non-employees	291		291
Foreign currency translation adjustment (loss) gain	(1)				(1)
Ending balance at Mar. 31, 2022	37,034		265,112	(228,054)	(24)
Ending balance (in shares) at Mar. 31, 2022		43,448,360
Beginning balance at Dec. 31, 2021	$ 48,246		263,345	(215,076)	(23)
Beginning balance (in shares) at Dec. 31, 2021	43,410,185	43,410,185
Net loss	$ (26,366)
Foreign currency translation adjustment (loss) gain	(2)
Ending balance at Jun. 30, 2022	$ 25,361		266,828	(241,442)	(25)
Ending balance (in shares) at Jun. 30, 2022	43,479,835	43,479,835
Beginning balance at Mar. 31, 2022	$ 37,034		265,112	(228,054)	(24)
Beginning balance (in shares) at Mar. 31, 2022		43,448,360
Net loss	(13,388)			(13,388)
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan	17		17
Issuance of common stock upon exercise of stock options, RSUs and employee stock purchase plan (in shares)		31,475
Share-based compensation expense related to issuance of stock options and RSUs to employees and employee stock purchase plan	1,410		1,410
Share‑based compensation expense related to issuance of stock options to non-employees	289		289
Foreign currency translation adjustment (loss) gain	(1)				(1)
Ending balance at Jun. 30, 2022	$ 25,361		$ 266,828	$ (241,442)	$ (25)
Ending balance (in shares) at Jun. 30, 2022	43,479,835	43,479,835