Condensed Consolidated Balance Sheets - Unaudited (Parenthetical) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Allowance for doubtful accounts | $ 70 | $ 263 |
| Preferred stock, par value | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized | 10,000,000 | 10,000,000 |
| Preferred stock, shares issued | 0 | 0 |
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 39,451,256 | 31,626,635 |
| Common stock, shares outstanding | 38,635,883 | 30,881,148 |
| Treasury stock, shares | 815,373 | 745,487 |