Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 165,489		$ 269,175	$ (104,360)	$ 674
Beginning balance (in shares) at Dec. 31, 2020		25,261,832
Stock-based compensation expense	2,018		2,018
Currency translation gain (loss)	(371)				(371)
Net unrealized loss on marketable securities	(57)				(57)
Net loss	(25,647)			(25,647)
Ending balance at Jun. 30, 2021	141,432		271,193	(130,007)	246
Ending balance (in shares) at Jun. 30, 2021		25,261,832
Beginning balance at Mar. 31, 2021	152,571		270,206	(117,705)	70
Beginning balance (in shares) at Mar. 31, 2021		25,261,832
Stock-based compensation expense	987		987
Currency translation gain (loss)	153				153
Net unrealized loss on marketable securities	23				23
Net loss	(12,302)			(12,302)
Ending balance at Jun. 30, 2021	141,432		271,193	(130,007)	246
Ending balance (in shares) at Jun. 30, 2021		25,261,832
Beginning balance at Dec. 31, 2021	117,223		273,655	(156,112)	(320)
Beginning balance (in shares) at Dec. 31, 2021		25,261,832
Stock-based compensation expense	2,823		2,823
Issuance of common stock; net of issuance costs of $0.1 million	23		23
Issuance of common stock; net of issuance costs of $0.1 million (in shares)		80,306
Currency translation gain (loss)	(889)				(889)
Net unrealized loss on marketable securities	(360)				(360)
Reclassification adjustment for loss included in net income	70				70
Net loss	(33,825)			(33,825)
Ending balance at Jun. 30, 2022	85,065		276,501	(189,937)	(1,499)
Ending balance (in shares) at Jun. 30, 2022		25,342,138
Beginning balance at Mar. 31, 2022	101,314		275,059	(173,050)	(695)
Beginning balance (in shares) at Mar. 31, 2022		25,261,832
Stock-based compensation expense	1,419		1,419
Issuance of common stock; net of issuance costs of $0.1 million	23		23
Issuance of common stock; net of issuance costs of $0.1 million (in shares)		80,306
Currency translation gain (loss)	(719)				(719)
Net unrealized loss on marketable securities	(155)				(155)
Reclassification adjustment for loss included in net income	70				70
Net loss	(16,887)			(16,887)
Ending balance at Jun. 30, 2022	$ 85,065		$ 276,501	$ (189,937)	$ (1,499)
Ending balance (in shares) at Jun. 30, 2022		25,342,138