Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated other Compressive Loss [Member]
Balances at beginning at Dec. 31, 2020	$ 45,547	$ 80	$ 227,912	$ (182,445)
Balances at beginning (shares) at Dec. 31, 2020		79,615,692
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,095		1,095
Issuance of restricted stock units under equity incentive plan		167,060
Tax withholding payments for net share-settled equity awards	(120)		(120)
Tax withholding payments for net share-settled equity awards (shares)		(59,072)
Net loss	(8,954)			(8,954)
Balances at ending at Mar. 31, 2021	37,568	$ 80	228,887	(191,399)
Balances at end (shares) at Mar. 31, 2021		79,723,680
Balances at beginning at Dec. 31, 2020	45,547	$ 80	227,912	(182,445)
Balances at beginning (shares) at Dec. 31, 2020		79,615,692
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19,942)
Balances at ending at Jun. 30, 2021	27,437	$ 80	229,744	(202,387)
Balances at end (shares) at Jun. 30, 2021		79,759,225
Balances at beginning at Mar. 31, 2021	37,568	$ 80	228,887	(191,399)
Balances at beginning (shares) at Mar. 31, 2021		79,723,680
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	857		857
Issuance of restricted stock units under equity incentive plan		35,545
Net loss	(10,988)			(10,988)
Balances at ending at Jun. 30, 2021	27,437	$ 80	229,744	(202,387)
Balances at end (shares) at Jun. 30, 2021		79,759,225
Balances at beginning at Dec. 31, 2021	17,793	$ 80	231,068	(213,355)
Balances at beginning (shares) at Dec. 31, 2021		79,864,310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	644		644
Issuance of restricted stock units under equity incentive plan		279,757
Tax withholding payments for net share-settled equity awards	(16)		(16)
Tax withholding payments for net share-settled equity awards (shares)		(55,251)
Sale of common stock and pre-funded warrants in public offering, net of costs of $1,034	13,766	$ 40	13,726
Sale of common stock and pre-funded warrants in public offering, net of costs (shares)		40,000,000
Net loss	(5,724)			(5,724)
Foreign currency translation adjustment	(2)				$ (2)
Balances at ending at Mar. 31, 2022	26,461	$ 120	245,422	(219,079)	(2)
Balances at end (shares) at Mar. 31, 2022		120,088,816
Balances at beginning at Dec. 31, 2021	17,793	$ 80	231,068	(213,355)
Balances at beginning (shares) at Dec. 31, 2021		79,864,310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12,449)
Foreign currency translation adjustment	(1)
Balances at ending at Jun. 30, 2022	20,308	$ 120	245,993	(225,804)	(1)
Balances at end (shares) at Jun. 30, 2022		120,088,816
Balances at beginning at Mar. 31, 2022	26,461	$ 120	245,422	(219,079)	(2)
Balances at beginning (shares) at Mar. 31, 2022		120,088,816
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	571		571
Net loss	(6,725)			(6,725)
Foreign currency translation adjustment	1				1
Balances at ending at Jun. 30, 2022	$ 20,308	$ 120	$ 245,993	$ (225,804)	$ (1)
Balances at end (shares) at Jun. 30, 2022		120,088,816