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Stock Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock-based compensation    
Stock-based compensation costs before income taxes $ 69 $ 221
General and administrative    
Stock-based compensation    
Stock-based compensation costs before income taxes 50 142
Research and development    
Stock-based compensation    
Stock-based compensation costs before income taxes $ 19 $ 79