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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:      
Loss carry-forwards and credits $ 8,531 $ 30,523  
Inventory and warranty reserves 15,404 15,015  
Accounts receivable and other accruals 2,343 2,885  
Stock-based compensation 3,713 3,255  
Executive supplemental retirement benefits 3,947 3,321  
Other   283  
Total deferred tax assets 33,938 55,282  
Deferred tax liabilities:      
Acquired intangible assets (9,434) (9,205)  
Depreciation and amortization (1,724) (2,609)  
Other (57)    
Total deferred tax liabilities (11,215) (11,814)  
Valuation allowance (6,127) (26,763) $ (27,102)
Net deferred tax assets $ 16,596 $ 16,705