|
Consolidated Balance Sheets (Parenthetical) (USD $)
|
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Preferred stock, par value | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Common shares, par value | $ 0.001 | $ 0.001 |
| Common shares authorized | 80,000,000 | 80,000,000 |
| Common shares issued | 43,587,346 | 37,474,944 |
| Common shares, shares outstanding | 43,587,346 | 37,474,944 |