|
Consolidated Balance Sheets (Parenthetical) (USD $)
|
Mar. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Stockholders equity: | ||
| Preferred stock, par value | $ 0.0001 | $ 0.0001 |
| Preferred stock, authorized shares | 5,000,000 | 5,000,000 |
| Preferred stock, issued shares | 0 | 0 |
| Preferred stock, outstanding shares | 0 | 0 |
| Common stock, par value | $ 0.0001 | $ 0.0001 |
| Common stock, authorized shares | 100,000,000 | 100,000,000 |
| Common stock, issued shares | 77,086,189 | 76,102,582 |
| Common stock, outstanding shares | 77,086,189 | 76,102,582 |