CONDENSED 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	[1]	Accumulated Earnings (Deficit)
Balances (in shares) at Dec. 31, 2020	[1]		28,392,000
Balances at Dec. 31, 2020		$ 55,514	$ 3	[1]			$ 483,456		$ (427,945)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of options (in shares)	[1]		73,000
Issuance of common stock in connection with stock offerings (in shares)	[1]		14,400,000
Issuance of common stock in connection with stock offerings		44,861	$ 1	[1]			44,860
Issuance of common stock in conjunction with vesting of restricted stock units or performance stock units, net of employee's withholding liability (in shares)	[1]				211,000	13,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(388)					(388)
Issuance of common stock upon exercise of warrant (in shares)	[1]		347,000
Stock-based compensation		772					772
Net income (loss)		4,544							4,544
Balances (in shares) at Mar. 31, 2021	[1]		43,436,000
Balances at Mar. 31, 2021		$ 105,303	$ 4	[1]			528,700		(423,401)
Balances (in shares) at Dec. 31, 2021		44,640,444	44,640,000	[1]
Balances at Dec. 31, 2021		$ 102,414	$ 4	[1]			531,636		(429,226)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in conjunction with vesting of restricted stock units or performance stock units, net of employee's withholding liability (in shares)	[1]				307,000
Issuance of common stock in conjunction with vesting of restricted stock units, net of employee's withholding liability		(598)					(598)
Issuance of common stock upon exercise of warrant (in shares)	[1]		388,000
Stock-based compensation		982					982
Net income (loss)		$ 9,064							9,064
Balances (in shares) at Mar. 31, 2022		45,335,426	45,335,000	[1]
Balances at Mar. 31, 2022		$ 111,862	$ 4	[1]			$ 532,020		$ (420,162)

[1] Adjusted to reflect the 1-for-4 reverse stock split effected on May 18, 2021.