Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 7,456	$ 7,082
Warranty	1,842	2,321
Corporate income tax payable	453	204
Contingent earn-out amount	1,174
Accrued satellite network and other equipment	497	1,642
Accrued inventory purchases	4,292	1,676
OG2 satellite milestone payable	4,609	3,185
Accrued interest expense	1,031	1,017
Accrued airtime charges	994	834
Other accrued expenses	8,083	6,097
Total accrued liabilities	$ 30,431	$ 24,058