8. STOCK OPTIONS AND WARRANTS (Tables)
|
12 Months Ended |
Apr. 30, 2017 |
| Employee stock option activity |
| |
|
Options |
|
|
Weighted
Average
Exercise Price
|
|
|
Weighted
Average
Grant Date
Fair Value
per Share
|
|
| |
|
|
|
|
|
|
|
|
|
| Outstanding, April 30, 2015 |
|
|
52,450,000 |
|
|
|
0.15 |
|
|
|
0.11 |
|
| Issued |
|
|
15,600,000 |
|
|
|
0.06 |
|
|
|
0.04 |
|
| Exercised |
|
|
– |
|
|
|
– |
|
|
|
– |
|
| Outstanding, April 30, 2016 |
|
|
68,050,000 |
|
|
|
0.13 |
|
|
|
0.09 |
|
| Issued |
|
|
23,550,000 |
|
|
|
0.10 |
|
|
|
0.08 |
|
| Forfeited |
|
|
(12,500,000 |
) |
|
|
0.07 |
|
|
|
0.04 |
|
| Exercised |
|
|
– |
|
|
|
– |
|
|
|
– |
|
| Outstanding, April 30, 2017 |
|
|
79,100,000 |
|
|
|
0.13 |
|
|
|
0.09 |
|
| Exercisable, April 30, 2017 |
|
|
72,300,000 |
|
|
$ |
0.13 |
|
|
|
– |
|
| Vested and expected to vest |
|
|
79,100,000 |
|
|
$ |
0.13 |
|
|
$ |
– |
|
|
| Unvested employee stock option activity |
| |
|
Options |
|
|
Weighted
Average
Grant Date
Fair Value
per Share
|
|
| |
|
|
|
|
|
|
| Non-vested, April 30, 2015 |
|
|
6,600,000 |
|
|
$ |
– |
|
| Granted |
|
|
15,600,000 |
|
|
|
0.05 |
|
| Vested |
|
|
(11,800,000 |
) |
|
|
– |
|
| Forfeited |
|
|
– |
|
|
|
– |
|
| Non-vested, April 30, 2016 |
|
|
10,400,000 |
|
|
|
– |
|
| Granted |
|
|
23,550,000 |
|
|
|
0.08 |
|
| Vested |
|
|
(14,650,000 |
) |
|
|
– |
|
| Forfeited |
|
|
(12,500,000 |
) |
|
|
– |
|
| Non-vested, April 30, 2017 |
|
|
6,800,000 |
|
|
$ |
0.10 |
|
|
| Range of outstanding stock options |
| |
Exercise Price |
|
| Exercise Price |
$ |
0.19 |
|
$ |
0.11 |
|
$ |
0.18 |
|
$ |
0.063 |
|
$ |
0.10 |
|
$ |
0.07 |
|
| Number of Options Outstanding |
|
25,000,000 |
|
|
27,200,000 |
|
|
250,000 |
|
|
15,600,000 |
|
|
10,450,000 |
|
|
600,000 |
|
| Weighted Average Remaining Contractual Life (years) of Outstanding Options |
|
2.42 |
|
|
2.67 |
|
|
2.97 |
|
|
3.67 |
|
|
2.92 |
|
|
4.00 |
|
| Weighted Average Exercise Price |
$ |
0.19 |
|
$ |
0.11 |
|
$ |
0.18 |
|
$ |
0.063 |
|
$ |
0.104 |
|
$ |
0.104 |
|
| Number of Options Exercisable |
|
25,000,000 |
|
|
27,200,000 |
|
|
250,000 |
|
|
15,600,000 |
|
|
3,650,000 |
|
|
600,000 |
|
| Weighted Average Exercise Price of Exercisable Options |
$ |
0.19 |
|
$ |
0.11 |
|
$ |
0.18 |
|
$ |
0.063 |
|
$ |
0.10 |
|
$ |
0.07 |
|
|
| Warrant activity |
| |
|
Warrants |
|
|
Weighted
Average
Exercise Price
|
|
| Outstanding, April 30, 2015 |
|
|
72,969,908 |
|
|
|
0.17 |
|
| Issued |
|
|
17,000,000 |
|
|
|
– |
|
| Exercised |
|
|
(5,000,000 |
) |
|
|
– |
|
| Outstanding, April 30, 2016 |
|
|
84,969,908 |
|
|
|
0.16 |
|
| Issued |
|
|
1,638,796 |
|
|
|
– |
|
| Expired |
|
|
(18,755,200 |
) |
|
|
– |
|
| Outstanding, April 30, 2017 |
|
|
67,853,504 |
|
|
|
– |
|
| Exercisable, April 30, 2017 |
|
|
67,853,504 |
|
|
$ |
0.13 |
|
|
| Schedule of warrants outstanding and exercisable |
| Range of Exercise Prices |
|
Number of
Warrant Shares
Exercisable at
04/30/2017
|
|
|
Weighted
Average
Remaining
Contractual
Life
|
|
|
Weighted
Average
Exercise Price
|
|
| $0.0575, $0.065, $0.075, $0.11, $0.12 and $0.18 |
|
|
67,853,504 |
|
|
|
1.85 |
|
|
|
0.13 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| Five Year Term – $0.075 |
|
|
1,056,000 |
|
|
|
0.44 |
|
|
|
|
|
| Five Year Term – $0.12 |
|
|
35,347,508 |
|
|
|
2.17 |
|
|
|
|
|
| Five Year Term – $0.18 |
|
|
19,811,200 |
|
|
|
0.67 |
|
|
|
|
|
| Five Year Term – $0.11 |
|
|
10,000,000 |
|
|
|
2.90 |
|
|
|
|
|
| Five Year Term – $0.065 |
|
|
769,231 |
|
|
|
4.64 |
|
|
|
|
|
| Five Year Term – $0.0575 |
|
|
869,565 |
|
|
|
4.93 |
|
|
|
|
|
| |
|
|
67,853,504 |
|
|
|
|
|
|
|
|
|
|
| Non-Employee Options [Member] |
|
| Assumptions |
| |
|
Years Ended April 30, |
|
| |
|
2017 |
|
|
2016 |
|
| Risk-free interest rate |
|
|
2.1% |
|
|
|
2.0% |
|
| Expected volatility |
|
|
108% |
|
|
|
140% |
|
| Expected lives (years) |
|
|
2.9 |
|
|
|
3.0 |
|
| Expected dividend yield |
|
|
0.00% |
|
|
|
0.00% |
|
|
| Employee Options [Member] |
|
| Assumptions |
| |
|
Years Ended April 30, |
|
| |
|
2017 |
|
|
2016 |
|
| Risk-free interest rate |
|
|
1.8% |
|
|
|
– |
|
| Expected volatility |
|
|
110% |
|
|
|
– |
|
| Expected lives (years) |
|
|
5.0 |
|
|
|
– |
|
| Expected dividend yield |
|
|
0.00% |
|
|
|
– |
|
|