Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
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
Stock-based compensation	495		495
Issuance of restricted stock units under equity incentive plans	136		136
Issuance of restricted stock units under equity incentive plans (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
Balances at beginning at Dec. 31, 2023	157,507	$ 32	433,885	(276,410)
Balances at beginning (shares) at Dec. 31, 2023		31,678,159
Stock-based compensation	6,445		6,445
Issuance of restricted stock units under equity incentive plans (shares)		11,034
Exercise of common stock warrants and pre-funded common stock warrants	923	$ 1	922
Exercise of common stock warrants and pre-funded common stock warrants (shares)		1,644,886
Exercise of stock options	15		15
Exercise of stock options (shares)		3,000
Unrealized loss on marketable securities	(105)				(105)
Foreign currency translation adjustment	(1)				(1)
Net loss	(21,398)			(21,398)
Balances at ending at Mar. 31, 2024	$ 143,386	$ 33	$ 441,267	$ (297,808)	$ (106)
Balances at end (shares) at Mar. 31, 2024		33,337,079