Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Acquisition related costs	$ 603	$ 605
Deferred revenues	2,521	2,558
Allowance for doubtful accounts	1,186	1,339
Inventory	1,420	865
Deferred compensation	5,346	4,807
Bonus accruals	942	680
Vacation accrual	246	219
Deferred rent	1,051	1,102
Warranty accrual	570	576
Accrued expenses	476	433
Satellite network and other property	7,314	2,329
Foreign tax credit	3,011	4,398
Alternative minimum tax credit	325	325
Tax loss carryforwards and credits	11,128	5,089
Other	7	4
Total deferred tax assets	36,146	25,329
Deferred tax liabilities:
Intangible Assets	(19,309)	(20,993)
Goodwill	(2,852)	(2,196)
Total deferred tax liabilities	(22,161)	(23,189)
Net deferred tax assets before valuation allowance	13,985	2,140
Less valuation allowance	(32,550)	(20,200)
Net deferred tax asset (liabilities)	(18,565)	(18,060)
Deferred tax assets, non-current	80	80
Deferred tax liabilities, non-current	$ (18,645)	$ (18,140)