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Income Taxes (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:        
Inventory $ 7,305 $ 5,262    
Unused investment tax credits 1,328 1,328    
Unused loss carryforward-regular tax 34,341 32,098    
Unused loss carryforward-undistributed earnings tax 14,695 11,861    
Other 2,425 2,533    
Total gross deferred tax assets 60,094 53,082    
Less: valuation allowance (51,242) (44,320) $ (40,966) $ (38,347)
Net deferred tax assets 8,852 8,762    
Deferred tax liabilities:        
Unrealized foreign exchange gain (1,181) (2,709)    
Advanced share-based compensation deductions 0 (141)    
Prepaid pension cost (417) (413)    
Acquired intangible assets (1,178) (1,573)    
Other (46) (10)    
Total gross deferred tax liabilities (2,822) (4,846)    
Net deferred tax assets $ 6,030 $ 3,916