Condensed Consolidated Statements of Stockholders' Equity (Dificit) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2022	37,235
Balance at Dec. 31, 2022	$ 37	$ 292,420	$ 0	$ (294,705)	$ (2,248)
Issuance of common stock under employee stock purchase plan (in shares)	262
Issuance of common stock under employee stock purchase plan	$ 0	291	0	0	291
Stock-based compensation expense	0	896	0	0	896
Net loss	$ 0	0	0	(9,801)	(9,801)
Issuance of shares upon exercise of warrants (in shares)	96
Issuance of shares upon exercise of warrants	$ 0	194	0	0	194
Balance (in shares) at Mar. 31, 2023	37,593
Balance at Mar. 31, 2023	$ 37	293,801	0	(304,506)	(10,668)
Balance (in shares) at Dec. 31, 2023	55,144
Balance at Dec. 31, 2023	$ 55	381,220	0	(336,915)	44,360
Issuance of common stock under employee stock purchase plan (in shares)	78
Issuance of common stock under employee stock purchase plan	$ 0	296	0	0	296
Issuance of common stock upon exercise of stock options (in shares)	3
Issuance of common stock upon exercise of stock options	$ 0	9	0	0	9
Stock-based compensation expense	0	1,759	0	0	1,759
Net loss	$ 0	0	0	(10,137)	(10,137)
Balance (in shares) at Mar. 31, 2024	55,225
Balance at Mar. 31, 2024	$ 55	$ 383,284	$ 0	$ (347,052)	$ 36,287