Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
|
| Summary of Significant Accounting Policies | ||||||||||||
| Net loss | $ 28,250 | $ 6,604 | $ 2,992 | $ 3,384 | $ 3,197 | $ 1,452 | $ 209 | $ 953 | $ 41,230 | $ 5,811 | $ 19,125 | |
| Net cash provided by (used in) operations | (18,184) | 450 | (25,877) | |||||||||
| Accumulated deficit | 175,276 | 134,046 | 175,276 | 134,046 | ||||||||
| Cash and cash equivalents | $ 112,801 | $ 96,729 | $ 112,801 | $ 96,729 | $ 9,722 | $ 39,208 | ||||||