|
Stock-Based Compensation (Details 2) (USD $)
|
12 Months Ended |
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Summary of stock-based compensation expense |
|
|
|
| Share-based compensation expense included in operating expenses |
$ 7,070,000 |
$ 1,508,000 |
$ 1,795,000 |
| Total unrecognized compensation expense |
16,000,000 |
|
|
| Weighted average period over which unrecognized compensation is expected to be recognized |
3 years |
|
|
| Research and development |
|
|
|
| Summary of stock-based compensation expense |
|
|
|
| Share-based compensation expense included in operating expenses |
1,953,000 |
302,000 |
338,000 |
| General and administrative |
|
|
|
| Summary of stock-based compensation expense |
|
|
|
| Share-based compensation expense included in operating expenses |
$ 5,117,000 |
$ 1,206,000 |
$ 1,457,000 |