Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 4,292	$ 4,453
Warranty	2,229	1,470
Corporate income tax payable	429	455
Contingent earn-out amount	2,156	1,115
Accrued satellite network and other equipment	977	1,188
Accrued inventory purchases	2,146	475
Milestone payable	5,460	5,460
Accrued interest expense	1,049	1,083
Accrued acquisition-related costs	92	417
Accrued credit facility financing fees	100	734
Accrued professional fees	395	448
Accrued airtime charges	791
Other accrued expenses	4,368	3,038
Total accrued liabilities	$ 24,484	$ 20,336