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Income Taxes (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:        
Inventory $ 5,262 $ 5,860    
Allowance for doubtful accounts 49 2,342    
Unused investment tax credits 1,328 4,665    
Unused loss carryforward-regular tax 32,098 29,369    
Unused loss carryforward-undistributed earnings tax 11,861 11,223    
Other 2,484 1,604    
Total gross deferred tax assets 53,082 55,063    
Less: valuation allowance (44,320) (40,966) $ (38,347) $ (44,995)
Net deferred tax assets 8,762 14,097    
Deferred tax liabilities:        
Unrealized foreign exchange gain (2,709) (2,193)    
Advanced share-based compensation deductions (141) (1,600)    
Prepaid pension cost (413) (414)    
Acquired intangible assets (1,573) (1,806)    
Other (10) (64)    
Total gross deferred tax liabilities (4,846) (6,077)    
Net deferred tax assets $ 3,916 $ 8,020