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Stock-Based Compensation Arrangements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation    
Stock-based compensation costs before income taxes $ 745 $ 1,223
Research and development    
Stock-based compensation    
Stock-based compensation costs before income taxes 240 392
General and administrative    
Stock-based compensation    
Stock-based compensation costs before income taxes $ 505 $ 831