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Stock-Based Compensation Arrangements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock-based compensation    
Stock-based compensation costs before income taxes $ 782 $ 745
Research and development    
Stock-based compensation    
Stock-based compensation costs before income taxes 305 240
General and administrative    
Stock-based compensation    
Stock-based compensation costs before income taxes $ 477 $ 505