CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock Series B Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning Balances at Dec. 31, 2020	$ 34,189	$ 5	$ 19	$ 452,129	$ (9,933)	$ (410,609)	$ 2,578
Beginning Balances (in shares) at Dec. 31, 2020		5,000	18,055
Net loss	(1,465)					(1,465)
Unrealized loss from foreign currency translation adjustments	(283)						(283)
Issuance of common stock in connection with vesting of stock awards (shares)			98
Proceeds from exercise of stock options	34			34
Proceeds from exercise of stock options			5
Stock-based compensation	758			758
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(253)				(253)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(25)
Issuance of common stock in connection with warrant exercise (shares)			28
Ending Balances at Mar. 31, 2021	32,980	$ 5	$ 19	452,921	(10,186)	(412,074)	2,295
Ending Balances (in shares) at Mar. 31, 2021		5,000	18,161
Beginning Balances at Dec. 31, 2021	74,512	$ 5	$ 24	492,657	(11,134)	(408,989)	1,949
Beginning Balances (in shares) at Dec. 31, 2021		5,000	22,230
Net loss	(999)					(999)
Unrealized loss from foreign currency translation adjustments	(175)						(175)
Issuance of common stock in connection with vesting of stock awards (shares)			88
Stock-based compensation	895			895
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(399)				(399)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(18)
Ending Balances at Mar. 31, 2022	$ 73,834	$ 5	$ 24	$ 493,552	$ (11,533)	$ (409,988)	$ 1,774
Ending Balances (in shares) at Mar. 31, 2022		5,000	22,300