Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details)

v3.7.0.1
Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 1,100 $ 2,014 $ 2,055 $ 3,452
General and administrative        
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense 764 604 1,359 1,349
Research and development        
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 336 $ 1,410 $ 696 $ 2,103