Income Taxes - Components of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets
Federal benefit of state tax liabilities	$ 11,112	$ 10,950
Reserves, accruals and other	30,564	38,285
Capitalized research and development	22,431	26,471
Amortization of intangibles other than goodwill	20,553	36,523
Net operating loss carryforwards	72,416	46,843
Depreciation	2,301
Deferred tax assets	159,377	159,072
Deferred Tax Liabilities
Reserves, accruals and other	(399)	(642)
Customer relationships	(4,558)	(6,012)
Depreciation		(95)
Deferred tax liability	(4,957)	(6,749)
Less: Valuation allowance	(154,252)	(152,138)	$ (151,339)	$ (125,782)
Net deferred tax liabilities	168	185
Recorded in the accompanying consolidated balance sheet as:
Current deferred tax assets	95	256
Current deferred tax liabilities	(194)	(152)
Noncurrent deferred tax assets	320	328
Noncurrent deferred tax liability	$ (53)	$ (247)