CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance at Dec. 31, 2021	$ 72,063	$ 26	$ (51)	$ 384,132		$ (312,044)
Beginning balance, Shares at Dec. 31, 2021		26,336,536
Employee stock plans	414	$ 1		413
Employee stock plans, Shares		592,209
Common stock issued	20,516	$ 23		20,493
Common stock shares issued		23,045,536
Issuance of pre-funded warrants, net of issuance costs	38,518			38,518
Stock-based compensation	7,482			7,482
Revaluation of warrants	73			73
Unrealized gain (loss) on short-term investments	(61)				$ (61)
Retirement of treasury stock			$ 51	(51)
Net loss	(57,050)					(57,050)
Ending balance at Dec. 31, 2022	81,955	$ 50		451,060	(61)	(369,094)
Ending balance, Shares at Dec. 31, 2022		49,974,281
Employee stock plans	35	$ 2		33
Employee stock plans, Shares		1,462,872
Stock-based compensation	7,276			7,276
Exercise of Common Stock Warrants, Shares		12,110,314
Exercise of Common Stock Warrants, Value		$ 12		(12)
Unrealized gain (loss) on short-term investments	72				72
Net loss	(60,919)					(60,919)
Ending balance at Dec. 31, 2023	$ 28,419	$ 64		$ 458,357	$ 11	$ (430,013)
Ending balance, Shares at Dec. 31, 2023		63,547,467