Consolidated Balance Sheets (Parenthetical) (Unaudited) - $ / shares |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, authorized (in shares) | 5,000,000 | 5,000,000 |
| Preferred stock, issued (in shares) | 0 | 0 |
| Preferred stock, outstanding (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, authorized (in shares) | 100,000,000 | 100,000,000 |
| Common stock, issued (in shares) | 57,418,432 | 56,954,830 |
| Common stock, outstanding (in shares) | 57,418,432 | 56,954,830 |