Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating Expenses [Abstract]
Revenue	$ 75,588	$ 72,013	$ 136,803	$ 141,174
Cost of revenue	41,213	36,248	69,621	72,601
Gross profit	34,375	35,765	67,182	68,573
Research and development	12,069	6,677	20,276	13,456
General and administrative	12,856	19,512	28,685	33,771
Sales and marketing	21,811	14,856	39,212	28,512
Total operating expenses	46,736	41,045	88,173	75,739
Operating loss	(12,361)	(5,280)	(20,991)	(7,166)
Interest income	41	29	77	60
Interest expense	(3,075)	(3,975)	(6,268)	(8,464)
Other income, net	0	(890)	5	(625)
Loss on debt extinguishment	0	(18,943)	0	(18,943)
Interest and other expense, net	(3,034)	(23,779)	(6,186)	(27,972)
Loss before income taxes	(15,395)	(29,059)	(27,177)	(35,138)
Income tax expense	(37)	(52)	(89)	(117)
Net loss	$ (15,432)	$ (29,111)	$ (27,266)	$ (35,255)
Net loss per share basic and diluted	$ (0.27)	$ (0.53)	$ (0.48)	$ (0.64)
Weighted-average number of shares used in calculating net loss per share	56,808,489	55,425,949	56,653,430	55,258,419