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 income (loss)	(4,407)					(4,407)
Unrealized income (loss) from foreign currency translation adjustments	104						104
Issuance of common stock in connection with vesting of stock awards (shares)			505,000
Stock-based compensation	2,182			2,182
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(604)				(604)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(131,000)
Issuance of common stock in connection with warrant exercise			$ 1	(1)
Issuance of common stock in connection with warrant exercise (shares)			387,000
Issuance of common stock in connection with earnout liability	489			489
Issuance of common stock in connection with earnout liability (shares)			157,000
Issuance of shares to non-employees	304			304
Issuance of shares to non-employees (shares)			62,000
Issuance of warrants	332			332
Ending Balances at Sep. 30, 2020	33,866	$ 5	$ 19	451,271	(9,647)	(409,911)	2,129
Ending Balances (in shares) at Sep. 30, 2020		5,000,000	17,966,000
Beginning Balances at Jun. 30, 2020	32,513	$ 5	$ 19	450,480	(9,451)	(410,300)	1,760
Beginning Balances (in shares) at Jun. 30, 2020		5,000,000	17,860,000
Net income (loss)	389					389
Unrealized income (loss) from foreign currency translation adjustments	369						369
Issuance of common stock in connection with vesting of stock awards (shares)			143,000
Stock-based compensation	791			791
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(196)				(196)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(37,000)
Ending Balances at Sep. 30, 2020	33,866	$ 5	$ 19	451,271	(9,647)	(409,911)	2,129
Ending Balances (in shares) at Sep. 30, 2020		5,000,000	17,966,000
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 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)			366,000
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)			(68,000)
Issuance of common stock in connection with warrant exercise (shares)			28,000
Issuance of common stock in connection with public offering	37,715		$ 4	37,711
Issuance of common stock in connection with public offering (shares)			3,779,000
Proceeds from exercise of stock options	$ 149		$ 1	148
Proceed of exercise of stock options (shares)	18,651		18,000
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		5,000,000	22,178,000
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		5,000,000	22,123,000
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)			73,000
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)			(20,000)
Proceeds from exercise of stock options	13		$ 1	12
Proceed of exercise of stock options (shares)			2,000
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		5,000,000	22,178,000