Income Taxes - Schedule of Deferred Tax Assets and Liabilities Classifications (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss and tax credit carryforwards	$ 32,328	$ 35,400
Valuation allowance	(30,065)	(34,146)
Accrued expenses	24,276	25,694
Deferred revenue	3,193	3,757
Depreciation and amortization	953	835
Other	54
Deferred tax assets, total	30,739	31,540
Deferred tax liabilities:
Depreciation and amortization	(19,826)	(20,172)
Deferred statutory income	(579)	(772)
Accrued liabilities	(1,104)	(141)
Other	(119)	(1)
Deferred tax liabilities, total	(21,628)	(21,086)
Net deferred tax assets	$ 9,111	$ 10,454