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Taxes (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Taxes    
Valuation allowance for deferred tax assets $ 49,374 $ 47,356
Change in valuation allowance 2,029 (4,189)
Federal    
Taxes    
NOLs carryforward 28,400 26,700
Foreign    
Taxes    
Income tax credits 4,000  
NOLs carryforward 178,200 171,700
State    
Taxes    
NOLs carryforward   18,700
Research and development | Foreign    
Taxes    
Income tax credits $ 2,000 $ 2,100