Stockholders' Equity - Warrants (Details) - $ / shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Dec. 31, 2015 |
|
| Common Stock | ||
| Class of Warrant or Right | ||
| Warrants outstanding | 131,597 | 190,885 |
| Outstanding warrants exercise price, weighted-average | $ 9.89 | $ 9.96 |
| Minimum | ||
| Class of Warrant or Right | ||
| Warrant expiration date | 2023-10 | |
| Maximum | ||
| Class of Warrant or Right | ||
| Warrant expiration date | 2024-02 |