Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Common stock par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock shares authorized (in shares) | 300,000,000 | 300,000,000 |
| Common stock shares issued (in shares) | 100,850,257 | 95,877,947 |
| Common stock shares outstanding (in shares) | 93,647,679 | 95,832,238 |
| Preferred stock par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock shares authorized (in shares) | 10,000,000 | 10,000,000 |
| Preferred stock, shares issued (in shares) | 0 | 0 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Treasury stock, shares held (in shares) | 7,202,578 | 0 |