Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Total stock based compensation expense | $ 2,590 | $ 2,285 | $ 7,314 | $ 4,611 |
Research and development | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Total stock based compensation expense | 1,182 | 557 | 2,879 | 1,644 |
General and administrative | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Total stock based compensation expense | $ 1,408 | $ 1,728 | $ 4,435 | $ 2,967 |