Consolidated Balance Sheets (Parenthetical) - shares |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Common stock, shares authorized | 35,000,000 | 35,000,000 |
| Common stock, shares issued | 27,590,531 | 19,031,059 |
| Treasury stock, shares | 646,247 | 622,447 |