Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 7,082	$ 4,453
Warranty	2,321	1,470
Corporate income tax payable	204	455
Portion of contingent consideration in accrued expenses		1,115
AIS deployment and license agreement		8
Accrued satellite network and other equipment	1,642	1,188
Accrued inventory purchases	1,676
Milestone payable	3,185	5,460
Accrued interest expense	1,017	1,083
Accrued acquisition-related and integration costs		417
Accrued credit facility financing fees		734
Accrued airtime charges	834
Other accrued expenses	6,225	3,953
Total accrued liabilities	$ 24,186	$ 20,336