CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series A, B, C and D Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Restricted Stock Units (RSUs) [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at Dec. 31, 2021	$ 88,289	$ 3	$ 32		$ 455,719	$ (367,463)	$ (2)
Balances, Shares at Dec. 31, 2021		3,218,152	32,393,738
Issuance of common stock upon the exercise of stock options	188				188
Issuance of common stock upon the exercise of stock options, shares			17,616
Issuance of common stock, net of issuance costs	3,626		$ 1		3,625
Issuance of common stock, net of issuance costs, shares			344,205
Share-based compensation expense	3,203				3,203
Unrealized loss on available-for-sale securities	(4)						(4)
Net loss	(32,829)					(32,829)
Balances at Mar. 31, 2022	62,473	$ 3	$ 33		462,735	(400,292)	$ (6)
Balances, Shares at Mar. 31, 2022		3,218,152	32,755,559
Balances at Dec. 31, 2022	$ 75,934		$ 52		489,760	(413,878)
Balances, Shares at Dec. 31, 2022			52,456,195
Issuance of common stock upon the exercise of stock options, shares	0
Issuance of common stock upon the vesting of restricted stock units	$ 1			$ 1
Issuance of common stock upon the vesting of restricted stock units, shares				115,618
Share-based compensation expense	2,170				2,170
Unrealized loss on available-for-sale securities	0
Net loss	(13,266)					(13,266)
Balances at Mar. 31, 2023	$ 64,839		$ 53		$ 491,930	$ (427,144)
Balances, Shares at Mar. 31, 2023			52,571,813