Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 30,078	$ 28,749
Services
Disaggregation of Revenue [Line Items]
Revenue	26,119	26,010
Services | United States
Disaggregation of Revenue [Line Items]
Revenue	19,252	18,380
Services | Canada
Disaggregation of Revenue [Line Items]
Revenue	3,811	4,486
Services | Europe
Disaggregation of Revenue [Line Items]
Revenue	2,122	2,246
Services | Central and South America
Disaggregation of Revenue [Line Items]
Revenue	564	569
Services | Others
Disaggregation of Revenue [Line Items]
Revenue	370	329
Services, Duplex
Disaggregation of Revenue [Line Items]
Revenue	8,645	8,783
Services, SPOT
Disaggregation of Revenue [Line Items]
Revenue	13,095	12,962
Services, Commercial IoT
Disaggregation of Revenue [Line Items]
Revenue	3,698	3,089
Services, IGO
Disaggregation of Revenue [Line Items]
Revenue	166	209
Services, Other
Disaggregation of Revenue [Line Items]
Revenue	515	967
Subscriber Equipment
Disaggregation of Revenue [Line Items]
Revenue	3,959	2,739
Subscriber Equipment | United States
Disaggregation of Revenue [Line Items]
Revenue	2,211	1,595
Subscriber Equipment | Canada
Disaggregation of Revenue [Line Items]
Revenue	812	350
Subscriber Equipment | Europe
Disaggregation of Revenue [Line Items]
Revenue	577	389
Subscriber Equipment | Central and South America
Disaggregation of Revenue [Line Items]
Revenue	312	388
Subscriber Equipment | Others
Disaggregation of Revenue [Line Items]
Revenue	47	17
Subscriber Equipment, Duplex
Disaggregation of Revenue [Line Items]
Revenue	251	431
Subscriber Equipment, SPOT
Disaggregation of Revenue [Line Items]
Revenue	1,591	1,474
Subscriber Equipment, Commercial loT
Disaggregation of Revenue [Line Items]
Revenue	2,072	833
Subscriber Equipment, Other
Disaggregation of Revenue [Line Items]
Revenue	$ 45	$ 1