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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Reserves and allowances not currently deductible for tax purposes $ 12,783 $ 15,506
Basis difference related to fixed assets 5,946 9,697
Compensation and benefits 7,807 9,273
Basis difference for inventory valuation 1,612 2,100
Compensatory stock options and rights 3,869 5,715
Deferred revenue and other 175 226
Operating loss carryforwards 21,799 75,110
Tax credit carryforwards 62,668 32,730
Basis difference related to intangible assets with a definite life 7,061 13,993
Other 634 389
Total deferred tax assets 124,354 164,739
Valuation allowance for deferred tax assets (11,114) (16,515)
Deferred tax assets, net of valuation allowance 113,240 148,224
Deferred tax liabilities:    
Prepaid expenses (773) (1,082)
Basis difference related to intangible assets with an indefinite life (22,891) (34,031)
Total deferred tax liabilities (23,664) (35,113)
Net deferred tax assets 89,576 113,111
Net deferred tax assets are shown on the accompanying consolidated balance sheets as follows:    
Non-current deferred tax assets 91,398 114,707
Non-current deferred tax liabilities $ (1,822) $ (1,596)