Unaudited Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Service revenue	$ 81,586	$ 63,790	$ 233,042	$ 180,725
Equipment revenue	22,449	21,589	66,216	54,845
Total revenue	104,035	85,379	299,258	235,570
Operating expenses:
Cost of service revenue (exclusive of items shown below)	42,747	35,191	123,942	92,296
Cost of equipment revenue (exclusive of items shown below)	11,906	9,614	30,519	25,391
Engineering, design and development	16,193	11,322	46,081	35,940
Sales and marketing	10,354	7,608	28,083	21,298
General and administrative	21,102	18,878	58,529	49,687
Depreciation and amortization	17,016	13,664	47,585	41,218
Total operating expenses	119,318	96,277	334,739	265,830
Operating loss	(15,283)	(10,898)	(35,481)	(30,260)
Other (income) expense:
Interest income	(11)	(14)	(35)	(47)
Interest expense	9,370	7,490	23,999	21,780
Fair value derivative adjustment				36,305
Other expense (income)	(35)	(2)	28	(2)
Total other expense	9,324	7,474	23,992	58,036
Loss before income taxes	(24,607)	(18,372)	(59,473)	(88,296)
Income tax provision	292	346	954	888
Net loss	(24,899)	(18,718)	(60,427)	(89,184)
Class A and Class B senior convertible preferred stock return				(29,277)
Accretion of preferred stock				(5,285)
Net loss attributable to common stock	$ (24,899)	$ (18,718)	$ (60,427)	$ (123,746)
Net loss attributable to common stock per share-basic and diluted	$ (0.29)	$ (0.22)	$ (0.71)	$ (3.48)
Weighted average number of shares-basic and diluted	85,226	84,097	85,103	35,521