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Stock Based Compensation - Expense Allocation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stock-based compensation    
Stock-based compensation expense $ 441 $ 2
Research and development    
Stock-based compensation    
Stock-based compensation expense 301 $ 2
General and administrative    
Stock-based compensation    
Stock-based compensation expense $ 140