CONDENSED CONSOLIDATED STATEMENT OF CONVERTIBLE PREFERRED STOCK AND 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 warrant (in shares)	11,980
Balance at the end of the period (in shares) at Mar. 31, 2021	59,669,722
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 warrants		14			14
Foreign currency translation adjustment			15		15
Stock-based compensation		833			833
Net loss				(9,134)	(9,134)
Balance at the end of the period at Mar. 31, 2021	$ 60	271,002	(564)	(232,119)	38,379
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 Mar. 31, 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			(158)		(158)
Stock-based compensation		1,204			1,204
Net loss				(10,376)	(10,376)
Balance at the end of the period at Mar. 31, 2022	$ 88	$ 372,842	$ (425)	$ (273,948)	$ 98,557