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)	(4,796)					(4,796)
Unrealized income (loss) from foreign currency translation adjustments	(265)						(265)
Issuance of common stock in connection with vesting of stock awards (shares)			362,000
Stock-based compensation	1,391			1,391
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(408)				(408)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(94,000)
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 Jun. 30, 2020	32,513	$ 5	$ 19	450,480	(9,451)	(410,300)	1,760
Ending Balances (in shares) at Jun. 30, 2020		5,000,000	17,860,000
Beginning Balances at Mar. 31, 2020	33,354	$ 5	$ 19	448,604	(9,268)	(407,551)	1,545
Beginning Balances (in shares) at Mar. 31, 2020		5,000,000	17,475,000
Net income (loss)	(2,749)					(2,749)
Unrealized income (loss) from foreign currency translation adjustments	215						215
Issuance of common stock in connection with vesting of stock awards (shares)			212,000
Stock-based compensation	751			751
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(183)				(183)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(46,000)
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 Jun. 30, 2020	32,513	$ 5	$ 19	450,480	(9,451)	(410,300)	1,760
Ending Balances (in shares) at Jun. 30, 2020		5,000,000	17,860,000
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)	1,001					1,001
Unrealized income (loss) from foreign currency translation adjustments	(220)						(220)
Issuance of common stock in connection with vesting of stock awards (shares)			293,000
Stock-based compensation	1,455			1,455
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(586)				(586)
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 (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	$ 136			136
Proceed of exercise of stock options (shares)	16,651		16,000
Ending Balances at Jun. 30, 2021	$ 73,690	$ 5	$ 23	491,431	(10,519)	(409,608)	2,358
Ending Balances (in shares) at Jun. 30, 2021		5,000,000	22,123,000
Beginning Balances at Mar. 31, 2021	32,980	$ 5	$ 19	452,921	(10,186)	(412,074)	2,295
Beginning Balances (in shares) at Mar. 31, 2021		5,000,000	18,161,000
Net income (loss)	2,466					2,466
Unrealized income (loss) from foreign currency translation adjustments	63						63
Issuance of common stock in connection with vesting of stock awards (shares)			195,000
Stock-based compensation	697			697
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(333)				(333)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(23,000)
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	102			102
Proceed of exercise of stock options (shares)			11,000
Ending Balances at Jun. 30, 2021	$ 73,690	$ 5	$ 23	$ 491,431	$ (10,519)	$ (409,608)	$ 2,358
Ending Balances (in shares) at Jun. 30, 2021		5,000,000	22,123,000