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Income Taxes (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:        
Inventory $ 6,639 $ 7,305    
Tax credit carryforwards 2,178 1,328    
Operating loss carryforward-statutory tax 38,264 34,341    
Operating loss carryforward-undistributed earnings tax 17,930 14,695    
Other 2,646 2,425    
Total gross deferred tax assets 67,657 60,094    
Less: valuation allowance (58,943) (51,242) $ (44,320) $ (40,966)
Net deferred tax assets 8,714 8,852    
Deferred tax liabilities:        
Unrealized foreign exchange gain (29) (1,181)    
Prepaid pension cost (450) (417)    
Acquired intangible assets (572) (1,178)    
Other (7) (46)    
Total gross deferred tax liabilities (1,058) (2,822)    
Net deferred tax assets $ 7,656 $ 6,030