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 Income (Loss) [Member]
Balances at beginning at Dec. 31, 2021	$ 17,793	$ 5	$ 231,143	$ (213,355)
Balances at beginning (shares) at Dec. 31, 2021		5,324,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	464		464
Issuance of restricted stock units under equity incentive plan	180		180
Issuance of restricted stock units under equity incentive plan (shares)		18,650
Tax withholding payments for net share-settled equity awards	(16)		(16)
Tax withholding payments for net share-settled equity awards (shares)		(3,683)
Sale of common stock\pre-funded warrants in public offering, net of costs	13,766	$ 3	13,763
Sale of common stock\pre-funded warrants in public offering, net of costs (shares)		2,666,667
Foreign currency translation adjustment	(2)				$ (2)
Net loss	(5,724)			(5,724)
Balances at ending at Mar. 31, 2022	26,461	$ 8	245,534	(219,079)	(2)
Balances at end (shares) at Mar. 31, 2022		8,005,921
Balances at beginning at Dec. 31, 2022	10,348	$ 8	247,762	(237,422)
Balances at beginning (shares) at Dec. 31, 2022		8,159,382
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	495		495
Issuance of restricted stock units under equity incentive plan	136		136
Issuance of restricted stock units under equity incentive plan (shares)		9,534
Tax withholding payments for net share-settled equity awards (shares)		(128)
Foreign currency translation adjustment	16				16
Net loss	(8,356)			(8,356)
Balances at ending at Mar. 31, 2023	$ 2,639	$ 8	$ 248,393	$ (245,778)	$ 16
Balances at end (shares) at Mar. 31, 2023		8,168,788