Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Sep. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Accounts receivable, allowance for doubtful accounts | $ 910 | $ 847 |
| Cumulative convertible preferred stock, at par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Cumulative convertible preferred stock, shares authorized | 100,000 | 100,000 |
| Cumulative convertible preferred stock, shares issued | 0 | 0 |
| Cumulative convertible preferred stock, shares outstanding | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized | 80,000,000 | 80,000,000 |
| Common stock, shares issued | 56,126,314 | 54,633,726 |
| Common stock, shares outstanding | 53,624,592 | 53,357,811 |
| Treasury stock, shares | 1,452,434 | 449,397 |