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 income (loss)	3,541					3,541
Unrealized income (loss) from foreign currency translation adjustments	(449)						(449)
Issuance of common stock in connection with vesting of stock awards (shares)			366
Stock-based compensation	2,027			2,027
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(920)				(920)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(68)
Issuance of common stock in connection with warrant exercise (shares)			28
Issuance of common stock in connection with public offering	37,715		$ 4	37,711
Issuance of common stock in connection with public offering (shares)			3,779
Proceeds from exercise of stock options	149		$ 1	148
Proceeds from exercise of stock options (shares)			18
Ending Balances at Sep. 30, 2021	$ 76,252	$ 5	$ 24	492,015	(10,853)	(407,068)	2,129
Ending Balances (in shares) at Sep. 30, 2021	22,178	5,000	22,178
Beginning Balances at Jun. 30, 2021	$ 73,690	$ 5	$ 23	491,431	(10,519)	(409,608)	2,358
Beginning Balances (in shares) at Jun. 30, 2021	22,123	5,000
Net income (loss)	$ 2,540					2,540
Unrealized income (loss) from foreign currency translation adjustments	$ (229)						(229)
Issuance of common stock in connection with vesting of stock awards (shares)	73
Stock-based compensation	$ 572			572
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	$ (334)				(334)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)	(20)
Proceeds from exercise of stock options	$ 13		1	12
Proceeds from exercise of stock options (shares)	2
Ending Balances at Sep. 30, 2021	$ 76,252	$ 5	$ 24	492,015	(10,853)	(407,068)	2,129
Ending Balances (in shares) at Sep. 30, 2021	22,178	5,000	22,178
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 income (loss)	(731)					(731)
Unrealized income (loss) from foreign currency translation adjustments	(1,490)						(1,490)
Issuance of common stock in connection with vesting of stock awards (shares)			314
Stock-based compensation	2,565			2,565
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(896)				(896)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(54)
Ending Balances at Sep. 30, 2022	$ 73,960	$ 5	$ 24	495,222	(12,030)	(409,720)	459
Ending Balances (in shares) at Sep. 30, 2022	22,490	5,000	22,490
Beginning Balances at Jun. 30, 2022	$ 73,506	$ 5	$ 24	494,370	(11,757)	(410,239)	1,103
Beginning Balances (in shares) at Jun. 30, 2022	22,444	5,000
Net income (loss)	$ 519					519
Unrealized income (loss) from foreign currency translation adjustments	$ (644)						(644)
Issuance of common stock in connection with vesting of stock awards (shares)	64
Stock-based compensation	$ 852			852
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	$ (273)				(273)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)	(18)
Ending Balances at Sep. 30, 2022	$ 73,960	$ 5	$ 24	$ 495,222	$ (12,030)	$ (409,720)	$ 459
Ending Balances (in shares) at Sep. 30, 2022	22,490	5,000	22,490