Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Expenses [Abstract]
Revenue	$ 87,303	$ 74,985	$ 224,106	$ 216,159
Cost of revenue	51,652	36,943	121,273	109,544
Gross profit	35,651	38,042	102,833	106,615
Research and development	10,035	7,158	30,311	20,614
General and administrative	17,156	18,890	45,841	52,661
Sales and marketing	24,194	14,870	63,406	43,382
Total operating expenses	51,385	40,918	139,558	116,657
Operating loss	(15,734)	(2,876)	(36,725)	(10,042)
Interest income	46	32	123	92
Interest expense	(3,167)	(3,043)	(9,435)	(11,507)
Other expense, net	(10)	(677)	(5)	(1,302)
Loss on debt extinguishment	0	(4,260)	0	(23,203)
Interest and other expense, net	(3,131)	(7,948)	(9,317)	(35,920)
Loss before income taxes	(18,865)	(10,824)	(46,042)	(45,962)
Income tax expense	(62)	(21)	(151)	(138)
Net loss	$ (18,927)	$ (10,845)	$ (46,193)	$ (46,100)
Net loss per share basic and diluted	$ (0.33)	$ (0.19)	$ (0.81)	$ (0.83)
Weighted-average number of shares used in calculating net loss per share	56,898,281	55,819,242	56,735,944.000	55,447,414