CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenue	$ 2,931	$ 3,481	$ 9,698	$ 11,417
Operating expenses:
Cost of revenue (exclusive of depreciation and amortization)	1,804	1,988	5,881	6,697
Research and development	215	296	690	875
Sales and marketing	58	69	278	369
General and administrative	1,170	970	3,132	2,843
Impairment charges	975	1,707	3,150	1,712
Depreciation and amortization	179	451	596	1,370
Total operating expenses	4,401	5,481	13,727	13,866
Loss from operations	(1,470)	(2,000)	(4,029)	(2,449)
Interest and other income (expense), net	0	8,820	(415)	8,065
Income (loss) before income taxes	(1,470)	6,820	(4,444)	5,616
Income tax benefit	0	284	0	230
Net income (loss)	(1,470)	7,104	(4,444)	5,846
Preferred stock dividends	3	3	9	9
Net income (loss) attributable to common stockholders	$ (1,473)	$ 7,101	$ (4,453)	$ 5,837
Net income (loss) attributable to common stockholders per share:
Basic net income (loss) per share (in dollars per share)	$ (0.03)	$ 0.19	$ (0.09)	$ 0.16
Diluted net income (loss) per share (in dollars per share)	$ (0.03)	$ 0.19	$ (0.09)	$ 0.15
Weighted-average number of shares of common stock:
Basic (in shares)	48,851	36,897	47,489	37,078
Diluted (in shares)	48,851	37,897	47,489	38,078