Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Series 1 Preferred
Preferred stock, beginning balance (in shares) at Dec. 31, 2020							452,000
Preferred stock, beginning balance at Dec. 31, 2020							$ 18,036
Preferred stock, ending balance (in shares) at Mar. 31, 2021							452,000
Preferred stock, ending balance at Mar. 31, 2021							$ 18,036
Balance, beginning of period (in shares) at Dec. 31, 2020		8,385,650	67,746
Balance, beginning of period at Dec. 31, 2020	$ (2,497)	$ 84	$ (5,056)	$ 543,561	$ (540,747)	$ (339)
Increase (Decrease) in Stockholders' Equity
Share-based compensation	903			903
Exercise of restricted stock unit awards (in shares)		369
Comprehensive loss	(11,267)				(11,267)	0
Balance, end of period (in shares) at Mar. 31, 2021		8,386,019	67,746
Balance, end of period at Mar. 31, 2021	(12,861)	$ 84	$ (5,056)	544,464	(552,014)	(339)
Preferred stock, beginning balance (in shares) at Dec. 31, 2021							452,000
Preferred stock, beginning balance at Dec. 31, 2021	18,036						$ 18,036
Preferred stock, ending balance (in shares) at Mar. 31, 2022							452,000
Preferred stock, ending balance at Mar. 31, 2022	18,036						$ 18,036
Balance, beginning of period (in shares) at Dec. 31, 2021		8,497,025	67,746
Balance, beginning of period at Dec. 31, 2021	24,395	$ 85	$ (5,056)	580,156	(550,452)	(338)
Increase (Decrease) in Stockholders' Equity
Share-based compensation	599			599
Issuance of common stock upon vesting of restricted stock units (in shares)		122,928
Issuance of common stock upon vesting of restricted stock units	0	$ 1		(1)
Issuance of common stock upon exercise of pre-funded warrants (in shares)		56,950
Issuance of common stock upon exercise of pre-funded warrants	0	$ 1		(1)
Comprehensive loss	(7,565)				(7,562)	(3)
Balance, end of period (in shares) at Mar. 31, 2022		8,676,903	67,746
Balance, end of period at Mar. 31, 2022	$ 17,429	$ 87	$ (5,056)	$ 580,753	$ (558,014)	$ (341)