Segment Reporting - Financial Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Revenue
External customers	$ 151,952	$ 123,031	$ 431,317	$ 346,330
Intersegment revenue	0	0	0	0
Income (loss) from operations	(87,350)	9,533	(101,617)	(233)
Goodwill	172,139		172,139		$ 159,342
Total assets	662,899		662,899		563,316
Consumer
Revenue
External customers	144,648	116,115	411,178	326,448
Intersegment revenue	0	0	0	0
Income (loss) from operations	(84,249)	12,703	(90,456)	11,292
Goodwill	112,602		112,602		99,805
Total assets	561,812		561,812		455,035
Enterprise
Revenue
External customers	7,304	6,916	20,139	19,882
Intersegment revenue	2,068	1,718	6,232	4,868
Income (loss) from operations	(3,101)	(3,170)	(11,161)	(11,525)
Goodwill	59,537		59,537		59,537
Total assets	101,761		101,761		108,905
Eliminations
Revenue
External customers	0	0	0	0
Intersegment revenue	(2,068)	(1,718)	(6,232)	(4,868)
Income (loss) from operations	0	$ 0	0	$ 0
Goodwill	0		0		0
Total assets	$ (674)		$ (674)		$ (624)