Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Services revenue	$ 117,708	$ 103,719	$ 91,213
Cost of revenue:
Services cost of revenue	6,167	5,880	6,544
Amortization of acquired technology	7,546	7,450	7,450
Total cost of revenue	13,713	13,330	13,994
Engineering and technology	5,107	3,758	3,249
Sales and marketing	45,854	42,671	40,172
General and administrative	43,563	25,315	23,346
Depreciation	1,521	1,300	1,238
Amortization of other acquired intangible assets	12,757	12,742	12,692
Total operating expenses	122,515	99,116	94,691
Operating income (loss)	(4,807)	4,603	(3,478)
Other loss, net	(12,542)	(13,489)	(29,568)
Loss from continuing operations before income taxes	(17,349)	(8,886)	(33,046)
Income tax benefit	4,623	3,342	7,385
Net loss from continuing operations	(12,726)	(5,544)	(25,661)
Income (loss) from discontinued operations, net of income taxes	27,348	30,003	(50,060)
Income (loss) from discontinued operations, net of income taxes	(27,348)	(30,003)	50,060
Net income (loss)	$ (40,074)	$ (35,547)	$ 24,399
Net income (loss) per share - basic:
Continuing operations (in USD per share)	$ (0.31)	$ (0.13)	$ (0.62)
Discontinued operations (in USD per share)	(0.67)	(0.73)	1.21
Basic net income (loss) per share (in USD per share)	(0.98)	(0.86)	0.59
Net income (loss) per share - diluted:
Continuing operations (in USD per share)	(0.31)	(0.13)	(0.62)
Discontinued operations (in USD per share)	(0.67)	(0.73)	1.21
Diluted net income (loss) per share (in USD per share)	$ (0.98)	$ (0.86)	$ 0.59
Weighted average shares outstanding:
Basic (in shares)	40,959	41,396	41,201
Diluted (in shares)	40,959	41,396	41,201
Other comprehensive income (loss):
Net income (loss)	$ (40,074)	$ (35,547)	$ 24,399
Unrealized gain (loss) on available-for-sale investments, net of tax	(236)	(1,119)	11
Foreign currency translation adjustment	(517)	0	0
Unrealized gain on derivative instrument, net of tax	0	0	266
Reclassification adjustment for realized (gain) loss on available-for-sale investments, net of tax, included in net income as Other loss, net	375	6	(1)
Reclassification adjustment for other-than-temporary impairment loss on available-for-sale investments, included in net income as discontinued operations	964	0	0
Other comprehensive income (loss)	586	(1,113)	276
Comprehensive income (loss)	$ (39,488)	$ (36,660)	$ 24,675