Income Taxes - Significant Portions of Deferred Income Tax Provision (Benefit) Due to Temporary Differences (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss and tax credit carryforwards	$ 3,564	$ 19,335	$ 8,029
Accrued expenses/liabilities	2,856	(4,505)	954
Depreciation and amortization	(2,231)	(6,220)	(5,030)
Valuation allowance	(1,958)	(3,706)	(1,887)
Deferred statutory income	266	(29)	(2,425)
Other	18	(10)	(3)
Total deferred provision (benefit) for income taxes	$ 2,515	$ 4,865	$ (362)