CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	At-the-market Offering	Common stock	Common stock At-the-market Offering	Additional paid-in capital	Additional paid-in capital At-the-market Offering	Accumulated deficit
Beginning balance (shares) at Dec. 31, 2021			2,976,541
Beginning balance at Dec. 31, 2021	$ 48,636		$ 5		$ 688,156		$ (639,525)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	4,670						4,670
Reclassification due to reverse stock split			$ (5)		5
Exercise of options, vesting of restricted stock units and shares issued under employee stock purchase plan (in shares)			4,183
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan	(25)				(25)
Stock-based compensation	893				893
Issuance of commitment shares (in shares)				92,644
Issuance of commitment shares (in values)		$ 0
Issuance of common stock, net of issuance costs (in shares)			143,770
Issuance of common stock, net of issuance costs	1,557				1,557
Ending balance (shares) at Mar. 31, 2022			3,217,138
Ending balance at Mar. 31, 2022	$ 55,731		$ 0		690,586		(634,855)
Beginning balance (in shares) at Dec. 31, 2022	3,000
Beginning balance at Dec. 31, 2022	$ 211
Increase (Decrease) in Temporary Equity [Roll Forward]
Redemption of convertible preferred stock, net issuance costs ( in shares)	(3,000)
Redemption of convertible preferred stock	$ (211)
Ending balance (in shares) at Mar. 31, 2023	0
Ending balance at Mar. 31, 2023	$ 0
Beginning balance (shares) at Dec. 31, 2022	3,229,704		3,229,704
Beginning balance at Dec. 31, 2022	$ 31,202		$ 0		693,937		(662,735)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(5,622)						(5,622)
Reclassification due to reverse stock split	0
Exercise of options, vesting of restricted stock units and shares issued under employee stock purchase plan (in shares)			6,989
Vesting of restricted stock units, net of withholding tax and shares issued under employee stock purchase plan	(12)				(12)
Stock-based compensation	856				856
Issuance of common stock, net of issuance costs (in shares)				34,589
Issuance of common stock, net of issuance costs		$ 156				$ 156
Redemption of convertible preferred stock, net issuance costs (in values)	$ (149)						(149)
Ending balance (shares) at Mar. 31, 2023	3,271,282		3,271,282
Ending balance at Mar. 31, 2023	$ 26,431		$ 0		$ 694,937		$ (668,506)