Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 213,685	$ 227,458	$ 413,234	$ 459,283
Operating expenses:
Cost of service revenue (exclusive of items shown below)	71,494	73,650	139,615	148,597
Cost of equipment revenue (exclusive of items shown below)	35,571	64,350	65,302	116,643
Engineering, design and development	26,912	28,409	51,640	58,186
Sales and marketing	12,994	15,427	25,312	31,328
General and administrative	27,081	21,133	49,535	46,292
Depreciation and amortization	29,967	31,938	60,716	67,857
Total operating expenses	204,019	234,907	392,120	468,903
Operating income (loss)	9,666	(7,449)	21,114	(9,620)
Other (income) expense:
Interest income	(1,230)	(1,328)	(2,379)	(2,404)
Interest expense	36,150	30,641	68,704	61,195
Loss on extinguishment of debt	57,962		57,962
Other (income) expense	443	374	(2,922)	(131)
Total other expense	93,325	29,687	121,365	58,660
Loss before income taxes	(83,659)	(37,136)	(100,251)	(68,280)
Income tax provision (benefit)	304	71	511	(3,654)
Net loss	$ (83,963)	$ (37,207)	$ (100,762)	$ (64,626)
Net loss attributable to common stock per share—basic and diluted	$ (1.04)	$ (0.47)	$ (1.25)	$ (0.81)
Weighted average number of shares—basic and diluted	80,702	79,783	80,575	79,718
Service [Member]
Revenue:
Total revenue	$ 173,731	$ 159,056	$ 338,743	$ 309,734
Product [Member]
Revenue:
Total revenue	$ 39,954	$ 68,402	$ 74,491	$ 149,549