Accrued Liabilities - Components of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Accrued compensation and benefits	$ 9,741	$ 8,637
Warranty	5,181	4,153
Acquired customer product liabilities	832	858
Corporate income tax payable	1,524	1,415
VAT Payable	728
Accrued satellite network and other equipment	891	595
Accrued inventory purchases	2,575	1,598
Accrued interest expense	10,000	4,944
Accrued professional fees	256	303
Accrued airtime charges	2,451	1,670
Other accrued expenses	9,150	8,843
Total accrued liabilities	$ 43,329	$ 33,016