Income Taxes - Schedule of Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net operating losses and tax credits	$ 111,538	$ 118,203
Property and equipment	12,302	12,077
Accruals and accrued loss contingencies	5,410	9,484
Intangible Assets	821	0
Gross deferred income tax assets	130,071	139,764
Prepaid expenses	(311)	(951)
Other	0	(408)
Intangible assets	0	(72)
Gross deferred income tax liabilities	(311)	(1,431)
Net deferred income tax assets	129,760	138,333
Valuation allowance	(45,777)	(114,190)
Total deferred income tax assets	$ 83,983	$ 24,143