Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details)

v3.8.0.1
Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 873 $ 1,714 $ 2,928 $ 5,166
General and administrative        
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense 591 572 1,950 1,921
Research and development        
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 282 643 $ 978 2,746
Restructuring charges        
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense   $ 499   $ 499