|
Condensed Balance Sheets (Parenthetical) (USD $)
|
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Preferred stock, par value | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized | 2,000,000 | 2,000,000 |
| Preferred stock, shares issued | ||
| Preferred stock, shares outstanding | ||
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 200,000,000 | 200,000,000 |
| Common stock, shares issued | 60,977,210 | 60,977,210 |
| Common stock, shares outstanding | 60,687,478 | 60,687,478 |
| Treasury stock, shares | 289,732 | 289,732 |