| Year Ended March 31, | ||||||||||||||||
| 2013 | 2012 | |||||||||||||||
| Warrants | Weighted Average Exercise Price |
Warrants | Weighted Average Exercise Price |
|||||||||||||
| Outstanding, beginning of year | 59,807,849 | $ | 0.14 | 38,675,169 | $ | 0.26 | ||||||||||
| Granted | 16,710,445 | $ | 0.11 | 28,159,240 | $ | 0.11 | ||||||||||
| Exercised | – | $ | – | (1,209,623 | ) | $ | 0.23 | |||||||||
| Cancelled/Forfeited | (871,000 | ) | $ | 0.25 | (5,816,937 | ) | $ | 0.26 | ||||||||
| Outstanding, end of year | 75,647,294 | $ | 0.11 | 59,807,849 | $ | 0.14 | ||||||||||
| Exercisable, end of year | 75,647,294 | $ | 0.11 | 59,807,849 | $ | 0.14 | ||||||||||
| Weighted average estimated fair value of warrants granted | $ | 0.07 | $ | 0.11 | ||||||||||||