CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Series B convertible preferred stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Noncontrolling Interest
Beginning Balances at Dec. 31, 2018	$ 33,700	$ 5	$ 17	$ 444,145	$ (8,153)	$ (404,353)	$ 2,209	$ (170)
Beginning Balances (in shares) at Dec. 31, 2018		5,000	15,967
Net income (loss)	670					670
Unrealized income (loss) from foreign currency translation adjustments	(302)						(302)
Issuance of common stock in connection with acquisition of business	1,635		$ 1	1,634
Issuance of common stock in connection with acquisition of business (shares)			419
Issuance of common stock in connection with vesting of stock awards (shares)			718
Stock-based compensation	2,069			2,069
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(688)				(688)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(138)
Issuance of common stock in connection with warrant exercise (shares)			10
Cancellation of holdback shares in connection with acquisition	(340)			(340)
Cancellation of holdback shares in connection with acquisition (shares)			(93)
Liquidation of subsidiary with noncontrolling interest	33			(137)			(33)	170
Ending Balances at Sep. 30, 2019	36,744	$ 5	$ 18	447,371	(8,841)	(403,683)	1,874
Ending Balances (in shares) at Sep. 30, 2019		5,000	16,883
Beginning Balances at Jun. 30, 2019	35,540	$ 5	$ 18	446,819	(8,656)	(404,752)	2,276	(170)
Beginning Balances (in shares) at Jun. 30, 2019		5,000	16,786
Net income (loss)	1,069					1,069
Unrealized income (loss) from foreign currency translation adjustments	(369)						(369)
Issuance of common stock in connection with vesting of stock awards (shares)			136
Stock-based compensation	689			689
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(185)				(185)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(39)
Liquidation of subsidiary with noncontrolling interest	33			(137)			(33)	$ 170
Ending Balances at Sep. 30, 2019	36,744	$ 5	$ 18	447,371	(8,841)	(403,683)	1,874
Ending Balances (in shares) at Sep. 30, 2019		5,000	16,883
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	16,986
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
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)
Issuance of common stock in connection with Viscount Earnout	489			489
Issuance of common stock in connection with Viscount Earnout, (shares)			157
Issuance of shares to non-employees	304			304
Issuance of shares to non-employees (shares)			62
Issuance of common stock in connection with warrant exercise			$ 1	(1)
Issuance of common stock in connection with warrant exercise (shares)			387
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	17,966
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	17,860
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
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)
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	17,966