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11. WARRANTS (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Summary of warrant activity exercisable and outstanding | A summary of warrant activity during the six months ended September 30, 2014 is presented below:
|  | Amount |  |  | Range of Exercise Price |  | Weighted Average Exercise Price |
Warrants outstanding at March 31, 2014 |  |  | 70,709,475 |  |  | $0.042 - $0.25 |  | $ | 0.13 |
Exercised |  |  | (2,166,104 | ) |  | $0.086 – $0.12 |  | $ | 0.10 |
Issued |  |  | 15,375,614 |  |  | $0.042 - $0.24 |  | $ | 0.07 |
Cancelled/Expired |  |  | (1,136,364 | ) |  | $0.13 |  | $ | 0.13 |
Warrants outstanding at September 30, 2014 |  |  | 82,782,621 |  |  | $0.042 - $0.25 |  | $ | 0.10 |
Warrants exercisable at September 30, 2014 |  |  | 82,782,621 |  |  | $0.042 - $0.25 |  | $ | 0.10 |
| The following is a summary of the stock options outstanding at March 31, 2014 and 2013 and the changes during the years then ended:
|  | Year Ended March 31, |
|  | 2014 |  |  | 2013 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding, beginning of year |  |  | 21,095,798 |  |  | $ | 0.28 |  |  |  | 19,428,693 |  |  | $ | 0.31 |
Granted |  |  | 5,220,536 |  |  | $ | 0.09 |  |  |  | 1,667,105 |  |  | $ | 0.08 |
Exercised |  |  | 182,927 |  |  | $ | 0.08 |  |  |  | – |  |  | $ | – |
Cancelled/Forfeited |  |  | – |  |  | $ | – |  |  |  | – |  |  | $ | – |
Outstanding, end of year |  |  | 26,133,407 |  |  | $ | 0.25 |  |  |  | 21,095,798 |  |  | $ | 0.28 |
Exercisable, end of year |  |  | 22,487,563 |  |  | $ | 0.27 |  |  |  | 19,141,625 |  |  | $ | 0.29 |
Weighted average estimated fair value of options granted |  |  |  |  |  | $ | 0.13 |  |  |  |  |  |  | $ | 0.08 |
Weighted average assumptions used to estimate the fair value, with respect to warrants utilizing the Binomial Lattice option pricing model | The following outlines the significant weighted average assumptions used to estimate the fair value information presented, with respect to warrants utilizing the Binomial Lattice option pricing models at, and during, the six months ended September 30, 2014:
Risk free interest rate |  | 0.79% - 2.29%
Average expected life |  | 5 years – 7 years
Expected volatility |  | 90.1% - 95.8%
Expected dividends |  | None
| The following outlines the significant weighted average assumptions used to estimate the fair value of warrants granted utilizing the Binomial Lattice option pricing model:
| Year Ended March 31,
| 2014 |  | 2013
Risk free interest rate | 1.3%-2.04% |  | 0.86%-1.56%
Average expected life | 5 to 7 years |  | 5 to 7 years
Expected volatility | 91.2% - 98.5% |  | 90.3% - 94.3%
Expected dividends | None |  | None

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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