CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Common Stock Restricted stock units	Common Stock Performance stock units	Additional Paid-in Capital	Accumulated Deficit
Balances (in shares) at Dec. 31, 2020		28,393,000
Balances at Dec. 31, 2020	$ 55,514	$ 3			$ 483,456	$ (427,945)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of options (in shares)	72,750	73,000
Issuance of common stock upon exercise of options	$ 193				193
Issuance of common stock in connection with stock offering and at the market program (in shares)		14,400,000
Issuance of common stock in connection with stock offering and at the market program	44,861	$ 1			44,860
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability (in shares)			583,000	13,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability	(418)				(418)
Issuance of common stock under employee stock purchase plan (in shares)		4,000
Issuance of common stock upon exercise of warrant		1,192,000
Stock split fractional shares settlement		(18,000)
Stock-based compensation	3,545				3,545
Net income (loss)	(1,281)					(1,281)
Comprehensive income (loss)	$ (1,281)					(1,281)
Balances (in shares) at Dec. 31, 2021	44,640,444	44,640,000
Balances at Dec. 31, 2021	$ 102,414	$ 4			531,636	(429,226)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of options (in shares)	22,631	23,000
Issuance of common stock upon exercise of options	$ 34				34
Issuance of common stock in connection with stock offering and at the market program (in shares)		2,464,000
Issuance of common stock in connection with stock offering and at the market program	7,020	$ 1			7,019
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability (in shares)			805,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability	(872)				(872)
Issuance of common stock upon exercise of warrant		388,000
Stock-based compensation	7,504				7,504
Net income (loss)	109,625					109,625
Comprehensive income (loss)	$ 109,625					109,625
Balances (in shares) at Dec. 31, 2022	48,319,838	48,320,000
Balances at Dec. 31, 2022	$ 225,725	$ 5			$ 545,321	$ (319,601)