CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock.	Additional Paid-in Capital.	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Balance at the beginning of the period (in shares) at Dec. 31, 2020	59,657,742
Increase (Decrease) in Shares Outstanding
Issuance of common stock upon exercise of stock options (in shares)	2,292
Issuance of common stock upon exercise of warrant (in shares)	11,980
Balance at the end of the period (in shares) at Jun. 30, 2021	59,672,014
Balance at the beginning of the period at Dec. 31, 2020	$ 60	$ 270,155	$ (579)	$ (222,985)	$ 46,651
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options		4			4
Issuance of common stock upon exercise of warrants		14			14
Foreign currency translation adjustment			130		130
Stock-based compensation		1,745			1,745
Net loss				(18,660)	(18,660)
Balance at the end of the period at Jun. 30, 2021	$ 60	271,918	(449)	(241,645)	29,884
Balance at the beginning of the period (in shares) at Mar. 31, 2021	59,669,722
Increase (Decrease) in Shares Outstanding
Issuance of common stock upon exercise of stock options (in shares)	2,292
Balance at the end of the period (in shares) at Jun. 30, 2021	59,672,014
Balance at the beginning of the period at Mar. 31, 2021	$ 60	271,002	(564)	(232,119)	38,379
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options		4			4
Foreign currency translation adjustment			115		115
Stock-based compensation		912			912
Net loss				(9,526)	(9,526)
Balance at the end of the period at Jun. 30, 2021	$ 60	271,918	(449)	(241,645)	29,884
Balance at the beginning of the period (in shares) at Dec. 31, 2021	88,318,454
Balance at the end of the period (in shares) at Jun. 30, 2022	88,318,454
Balance at the beginning of the period at Dec. 31, 2021	$ 88	371,638	(267)	(263,572)	107,887
Increase (Decrease) in Stockholders' Equity
Foreign currency translation adjustment			361		361
Stock-based compensation		2,470			2,470
Net loss				(27,400)	(27,400)
Balance at the end of the period at Jun. 30, 2022	$ 88	374,108	94	(290,972)	83,318
Balance at the beginning of the period (in shares) at Mar. 31, 2022	88,318,454
Balance at the end of the period (in shares) at Jun. 30, 2022	88,318,454
Balance at the beginning of the period at Mar. 31, 2022	$ 88	372,842	(425)	(273,948)	98,557
Increase (Decrease) in Stockholders' Equity
Foreign currency translation adjustment			519		519
Stock-based compensation		1,266			1,266
Net loss				(17,024)	(17,024)
Balance at the end of the period at Jun. 30, 2022	$ 88	$ 374,108	$ 94	$ (290,972)	$ 83,318