CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 3,293	$ 3,856	$ 6,767	$ 7,936
Operating expenses:
Cost of revenue (exclusive of depreciation and amortization)	1,930	2,261	4,077	4,709
Research and development	225	292	475	579
Sales and marketing	43	160	220	300
General and administrative	1,064	862	1,962	1,878
Impairment charges	1,525	0	2,175	0
Depreciation and amortization	185	460	417	919
Total operating expenses	4,972	4,035	9,326	8,385
Loss from operations	(1,679)	(179)	(2,559)	(449)
Interest and other expense, net	(10)	(384)	(415)	(755)
Loss before income taxes	(1,689)	(563)	(2,974)	(1,204)
Income tax expense	0	(27)	0	(54)
Net loss	(1,689)	(590)	(2,974)	(1,258)
Preferred stock dividends	3	3	6	6
Net loss attributable to common stockholders	$ (1,692)	$ (593)	$ (2,980)	$ (1,264)
Net loss attributable to common stockholders per share:
Basic and diluted net loss per share (in dollars per share)	$ (0.04)	$ (0.02)	$ (0.06)	$ (0.03)
Weighted-average number of shares of common stock:
Basic and diluted (in shares)	47,359	37,168	46,802	37,168