Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 9,367	$ 8,637
Accrued warranty obligations	5,624	4,153
Acquired customer product liabilities	546	858
Corporate income tax payable	1,521	1,415
Contingent consideration amount	2,063
VAT payable	2,286
Accrued satellite network and other equipment	227	595
Accrued inventory purchases	219	1,598
Accrued interest expense	5,000	4,944
Accrued professional fees	303	303
Accrued airtime charges	901	1,670
Other accrued expenses	7,678	8,843
Total accrued liabilities	$ 35,735	$ 33,016