CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Series B Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Noncontrolling Interest
Beginning Balances at Dec. 31, 2017	$ 23,853	$ 3	$ 15	$ 428,470	$ (7,485)	$ (399,647)	$ 2,675	$ (178)
Beginning Balances (in shares) at Dec. 31, 2017		3,000	14,436
Net income (loss)	(2,301)					(2,306)		5
Unrealized income (loss) from foreign currency translation adjustments	112						109	3
Impact of adoption of Topic 606 | Topic 606	2					2
Issuance of common stock in connection with acquisition of business	2,294		$ 1	2,293
Issuance of common stock in connection with acquisition of business (shares)			610
Issuance of common stock in connection with vesting of stock awards (shares)			139
Stock-based compensation	635			635
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(162)				(162)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(42)
Issuance costs associated with issuance of Series B preferred stock	(20)			(20)
Issuance of shares to non-employees	5			5
Ending Balances at Mar. 31, 2018	24,418	$ 3	$ 16	431,383	(7,647)	(401,951)	2,784	(170)
Ending Balances (in shares) at Mar. 31, 2018		3,000	15,143
Beginning Balances at Dec. 31, 2017	23,853	$ 3	$ 15	428,470	(7,485)	(399,647)	2,675	(178)
Beginning Balances (in shares) at Dec. 31, 2017		3,000	14,436
Net income (loss)	(5,046)
Ending Balances at Jun. 30, 2018	30,053	$ 5	$ 16	440,289	(7,763)	(404,696)	2,372	(170)
Ending Balances (in shares) at Jun. 30, 2018		5,000	15,339
Beginning Balances at Mar. 31, 2018	24,418	$ 3	$ 16	431,383	(7,647)	(401,951)	2,784	(170)
Beginning Balances (in shares) at Mar. 31, 2018		3,000	15,143
Net income (loss)	(2,745)					(2,745)
Unrealized income (loss) from foreign currency translation adjustments	(412)						(412)
Issuance of Series B preferred stock, net of issuance costs	7,915	$ 2		7,913
Issuance of Series B preferred stock, net of issuance costs (shares)		2,000
Issuance of common stock in connection with acquisition of business	341			341
Issuance of common stock in connection with acquisition of business (shares)			113
Issuance of common stock in connection with vesting of stock awards (shares)			110
Stock-based compensation	649			649
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(116)				(116)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(30)
Issuance of shares to non-employees	3			3
Issuance of shares to non-employees (shares)			3
Ending Balances at Jun. 30, 2018	30,053	$ 5	$ 16	440,289	(7,763)	(404,696)	2,372	(170)
Ending Balances (in shares) at Jun. 30, 2018		5,000	15,339
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)	(815)					(815)
Unrealized income (loss) from foreign currency translation adjustments	(129)						(129)
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)			126
Stock-based compensation	687			687
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(228)				(228)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(43)
Issuance of common stock in connection with warrant exercise (shares)			10
Ending Balances at Mar. 31, 2019	34,850	$ 5	$ 18	446,466	(8,381)	(405,168)	2,080	(170)
Ending Balances (in shares) at Mar. 31, 2019		5,000	16,479
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)	(399)
Ending Balances at Jun. 30, 2019	35,540	$ 5	$ 18	446,819	(8,656)	(404,752)	2,276	(170)
Ending Balances (in shares) at Jun. 30, 2019		5,000	16,786
Beginning Balances at Mar. 31, 2019	34,850	$ 5	$ 18	446,466	(8,381)	(405,168)	2,080	(170)
Beginning Balances (in shares) at Mar. 31, 2019		5,000	16,479
Net income (loss)	416					416
Unrealized income (loss) from foreign currency translation adjustments	196						196
Issuance of common stock in connection with vesting of stock awards (shares)			456
Stock-based compensation	693			693
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units	(275)				(275)
Shares withheld in payment of taxes in connection with net share settlement of restricted stock units (shares)			(56)
Cancellation of holdback shares in connection with acquisition	(340)			(340)
Cancellation of holdback shares in connection with acquisition (shares)			(93)
Ending Balances at Jun. 30, 2019	$ 35,540	$ 5	$ 18	$ 446,819	$ (8,656)	$ (404,752)	$ 2,276	$ (170)
Ending Balances (in shares) at Jun. 30, 2019		5,000	16,786