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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Carry-forward losses and credits $ 23,675 $ 25,834  
Inventory and warranty reserves 17,945 17,734  
Accrued expenses and other reserves 10,260 15,393  
Stock-based compensation 5,351 5,092  
Executive supplemental retirement benefits 5,972 4,984  
Other 2,396 597  
Total deferred tax assets 65,599 69,634  
Deferred tax liabilities:      
Acquired intangible assets (74,120) (83,092)  
Depreciation and amortization (8,332) (10,150)  
Loan costs (1,108) (2,157)  
Foreign withholding taxes (3,176) (16,206)  
Unrealized gain (1,952) (469)  
Total deferred tax liabilities (88,688) (112,074)  
Valuation allowance (17,936) (13,629) $ (12,527)
Net deferred tax (liabilities) assets $ (41,025) $ (56,069)