Revenue - Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 33,726	$ 28,123	$ 62,475	$ 52,775
Marketing, general and administrative	15,944	9,473	27,219	18,891
Other	(3,351)	(2,173)	(4,013)	(2,269)
Net income (loss)	(7,012)	(98,734)	80,918	(118,895)
Total comprehensive income (loss)	$ (4,382)	$ (98,779)	$ 83,218	$ (119,760)
Net income (loss) per common share:
Basic (USD per share)	$ (0.01)	$ (0.09)	$ 0.06	$ (0.11)
Diluted (USD per share)	$ (0.01)	$ (0.09)	$ 0.06	$ (0.11)
Impact of ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Marketing, general and administrative	$ (6)		$ (150)
Other	7		(42)
Net income (loss)	298		1,320
Total comprehensive income (loss)	$ 298		$ 1,320
Net income (loss) per common share:
Basic (USD per share)	$ 0.00		$ 0.01
Diluted (USD per share)	$ 0.00		$ 0.00
Legacy GAAP
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Marketing, general and administrative	$ 15,938		$ 27,069
Other	(3,344)		(4,055)
Net income (loss)	(6,714)		82,238
Total comprehensive income (loss)	$ (4,084)		$ 84,538
Net income (loss) per common share:
Basic (USD per share)	$ (0.01)		$ 0.07
Diluted (USD per share)	$ (0.01)		$ 0.06
Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 27,995	$ 24,301	$ 54,005	$ 45,782
Cost of goods and services	9,526	9,036	18,555	18,010
Services | Impact of ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	333		1,145
Services | Legacy GAAP
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	28,328		55,150
Subscriber equipment sales
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	5,731	3,822	8,470	6,993
Cost of goods and services	4,170	$ 2,778	6,342	$ 4,874
Subscriber equipment sales | Impact of ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(117)		(81)
Cost of goods and services	(83)		(64)
Subscriber equipment sales | Legacy GAAP
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	5,614		8,389
Cost of goods and services	$ 4,087		$ 6,278