CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Series B Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning Balances at Dec. 31, 2019	$ 35,466	$ 5	$ 18	$ 447,965	$ (9,043)	$ (405,504)	$ 2,025
Beginning Balances (in shares) at Dec. 31, 2019		5,000,000	16,986,000
Net loss	(2,047)					(2,047)
Unrealized loss from foreign currency translation adjustments	(480)						(480)
Issuance of common stock in connection with vesting of stock awards (shares)			150,000
Stock-based compensation	640			640
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(225)				(225)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(48,000)
Issuance of common stock in connection with warrant exercise			$ 1	(1)
Issuance of common stock in connection with warrant exercise (shares)			387,000
Ending Balances at Mar. 31, 2020	33,354	$ 5	$ 19	448,604	(9,268)	(407,551)	1,545
Ending Balances (in shares) at Mar. 31, 2020		5,000,000	17,475,000
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		5,000,000	18,055,000
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)			98,000
Proceeds of exercise of stock options	$ 34			34
Proceed of exercise of stock options (shares)	5,254		5,000
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)			(25,000)
Issuance of common stock in connection with warrant exercise (shares)			28,000
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		5,000,000	18,161,000