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Stock-Based Compensation - Expense Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock-based compensation    
Stock-based compensation expense $ 3,828 $ 428
Research and development    
Stock-based compensation    
Stock-based compensation expense 1,685 292
General and administrative    
Stock-based compensation    
Stock-based compensation expense $ 2,143 $ 136