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 |