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Income Taxes - Significant Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:      
Loss carry-forwards and credits $ 28,138 $ 29,032  
Inventory and warranty reserves 10,890 10,959  
Accounts receivable and other accruals 2,615 2,647  
Stock-based compensation 3,581 5,032  
Executive supplemental retirement benefits 8,026 6,132  
Other 63    
Total deferred tax assets 53,313 53,802  
Deferred tax liabilities:      
Acquired intangible assets (2,782) (5,857)  
Depreciation and amortization (5,085) (4,461)  
Other (1,202) (1,145)  
Total deferred tax liabilities (9,069) (11,463)  
Valuation allowance (27,102) (27,497) (26,475)
Net deferred tax assets $ 17,142 $ 14,842