Income Taxes - Components of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Federal benefit of state tax liabilities	$ 7,809	$ 7,510
Reserves, accruals and other	11,005	9,251
Inventory obsolescence	428	239
Capitalized research and development	7,491	9,941
Amortization of intangibles other than goodwill	2,809	3,903
Net operating loss carryforwards	55,938	63,202
Depreciation	0	972
Deferred tax assets	85,480	95,018
Deferred Tax Liabilities
Reserves, accruals and other	(1,078)	(1,346)
Customer relationships	(986)	(1,294)
Depreciation	(727)	0
Deferred tax liability	(2,791)	(2,640)
Less: valuation allowance	(1,240)	(5,368)	$ (140,915)
Net deferred tax liabilities	81,449	87,010
Recorded in the accompanying consolidated balance sheets as
Reserves, accruals and other	$ 81,449	$ 87,010