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Summary of Significant Accounting Policies - Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock based compensation        
Stock-based compensation expense $ 517 $ 354 $ 1,065 $ 655
Research and development        
Stock based compensation        
Stock-based compensation expense 179 165 351 333
General and administrative        
Stock based compensation        
Stock-based compensation expense $ 338 $ 189 $ 714 $ 322