5. STOCK OPTIONS AND WARRANTS (Tables)
|
3 Months Ended |
Jul. 31, 2019 |
|---|
| Share-based Payment Arrangement [Abstract] |
|
| Assumptions |
| |
|
Three Months Ended July 31, |
|
| |
|
2019 |
|
|
2018 |
|
| Risk-free interest rate |
|
|
2.1% |
|
|
|
– |
|
| Expected volatility |
|
|
91% |
|
|
|
– |
|
| Expected lives (years) |
|
|
2.5 |
|
|
|
– |
|
| Expected dividend yield |
|
|
0.00% |
|
|
|
– |
|
|
| Employee stock option activity |
|
|
Options |
|
|
Weighted
Average
Exercise Price |
|
|
Weighted
Average
Grant Date
Fair
Value
per Share |
|
| Outstanding, April 30, 2019 |
|
|
107,450,000 |
|
|
$ |
0.11 |
|
|
$ |
0.11 |
|
| Issued |
|
|
1,500,000 |
|
|
|
0.04 |
|
|
$ |
0.04 |
|
| Forfeited |
|
|
– |
|
|
|
– |
|
|
|
– |
|
| Exercised |
|
|
– |
|
|
|
– |
|
|
|
– |
|
| Outstanding, July 31, 2019 |
|
|
108,950,000 |
|
|
$ |
0.11 |
|
|
$ |
0.10 |
|
| Exercisable, July 31, 2019 |
|
|
105,200,000 |
|
|
$ |
0.11 |
|
|
|
– |
|
| Vested and expected to vest |
|
|
108,950,000 |
|
|
$ |
0.11 |
|
|
|
– |
|
|
| Unvested employee stock option activity |
| |
|
Options |
|
|
Weighted
Average
Grant Date
Fair
Value |
|
| |
|
|
|
|
|
|
| Unvested, April 30, 2019 |
|
|
6,200,000 |
|
|
$ |
0.05 |
|
| Granted |
|
|
1,500,000 |
|
|
$ |
0.04 |
|
| Vested |
|
|
(3,950,000 |
) |
|
$ |
0.05 |
|
| Forfeited |
|
|
– |
|
|
|
– |
|
| Unvested, July 31, 2019 |
|
|
3,750,000 |
|
|
$ |
0.05 |
|
|
| Range of outstanding stock options |
| Exercise
Price |
|
|
Number
of
Options
Outstanding |
|
|
Weighted
Average
Remaining
Contractual Life
(years) of
Outstanding
Options |
|
|
Weighted
Average
Exercisable
Price |
|
|
Number
of
Options
Exercisable |
|
|
Weighted
Average
Exercise Price
of Exercisable
Options |
|
| $ |
0.190 |
|
|
|
25,000,000 |
|
|
|
0.08 |
|
|
$ |
0.190 |
|
|
|
25,000,000 |
|
|
$ |
0.190 |
|
| $ |
0.110 |
|
|
|
27,200,000 |
|
|
|
0.22 |
|
|
$ |
0.110 |
|
|
|
27,200,000 |
|
|
$ |
0.110 |
|
| $ |
0.184 |
|
|
|
250,000 |
|
|
|
0.36 |
|
|
$ |
0.184 |
|
|
|
250,000 |
|
|
$ |
0.184 |
|
| $ |
0.063 |
|
|
|
15,600,000 |
|
|
|
0.85 |
|
|
$ |
0.063 |
|
|
|
15,600,000 |
|
|
$ |
0.063 |
|
| $ |
0.104 |
|
|
|
10,450,000 |
|
|
|
1.68 |
|
|
$ |
0.104 |
|
|
|
10,450,000 |
|
|
$ |
0.104 |
|
| $ |
0.0685 |
|
|
|
600,000 |
|
|
|
1.75 |
|
|
$ |
0.0685 |
|
|
|
600,000 |
|
|
$ |
0.0685 |
|
| $ |
0.058 |
|
|
|
2,450,000 |
|
|
|
2.18 |
|
|
$ |
0.058 |
|
|
|
2,450,000 |
|
|
$ |
0.058 |
|
| $ |
0.0734 |
|
|
|
1,200,000 |
|
|
|
2.75 |
|
|
$ |
0.0734 |
|
|
|
1,200,000 |
|
|
$ |
0.0734 |
|
| $ |
0.0729 |
|
|
|
1,800,000 |
|
|
|
2.95 |
|
|
$ |
0.0729 |
|
|
|
1,800,000 |
|
|
$ |
0.0729 |
|
| $ |
0.089 |
|
|
|
1,200,000 |
|
|
|
2.97 |
|
|
$ |
0.089 |
|
|
|
1,200,000 |
|
|
$ |
0.089 |
|
| $ |
0.0553 |
|
|
|
500,000 |
|
|
|
1.60 |
|
|
$ |
0.0553 |
|
|
|
500,000 |
|
|
$ |
0.0553 |
|
| $ |
0.0558 |
|
|
|
9,000,000 |
|
|
|
2.05 |
|
|
$ |
0.0558 |
|
|
|
9,000,000 |
|
|
$ |
0.0558 |
|
| $ |
0.0534 |
|
|
|
1,200,000 |
|
|
|
4.10 |
|
|
$ |
0.0534 |
|
|
|
1,200,000 |
|
|
$ |
0.0534 |
|
| $ |
0.0539 |
|
|
|
1,000,000 |
|
|
|
1.88 |
|
|
$ |
0.0539 |
|
|
|
1,000,000 |
|
|
$ |
0.0539 |
|
| $ |
0.0683 |
|
|
|
500,000 |
|
|
|
1.96 |
|
|
$ |
0.0683 |
|
|
|
500,000 |
|
|
$ |
0.0683 |
|
| $ |
0.0649 |
|
|
|
500,000 |
|
|
|
2.10 |
|
|
$ |
0.0649 |
|
|
|
500,000 |
|
|
$ |
0.0649 |
|
| $ |
0.0404 |
|
|
|
1,000,000 |
|
|
|
2.38 |
|
|
$ |
0.0404 |
|
|
|
1,000,000 |
|
|
$ |
0.0404 |
|
| $ |
0.0370 |
|
|
|
500,000 |
|
|
|
2.46 |
|
|
$ |
0.0370 |
|
|
|
500,000 |
|
|
$ |
0.0370 |
|
| $ |
0.0495 |
|
|
|
9,000,000 |
|
|
|
2.78 |
|
|
$ |
0.0495 |
|
|
|
5,250,000 |
|
|
$ |
0.0495 |
|
| |
Total |
|
|
|
108,950,000 |
|
|
|
1.05 |
|
|
$ |
0.11 |
|
|
|
105,200,000 |
|
|
$ |
0.11 |
|
|
| Warrant activity |
| |
|
Warrants |
|
|
Weighted
Average
Exercise Price |
|
| Outstanding, April 30, 2019 |
|
|
42,077,797 |
|
|
$ |
0.09 |
|
| Issued |
|
|
3,333,333 |
|
|
|
0.02 |
|
| Expired |
|
|
– |
|
|
|
– |
|
| Outstanding, July 31, 2019 |
|
|
45,411,130 |
|
|
|
– |
|
| Exercisable, July 31, 2019 |
|
|
45,411,130 |
|
|
$ |
0.08 |
|
|
| Schedule of warrants outstanding and exercisable |
| Exercise Prices |
|
Number of
Warrant Shares
Exercisable at
July 31, 2019 |
|
|
Weighted
Average
Remaining
Contractual
Life |
|
|
Weighted
Average
Exercise Price |
|
| |
|
|
|
|
|
|
|
|
|
| $0.12 |
|
|
17,854,308 |
|
|
|
1.38 |
|
|
|
|
|
| $0.11 |
|
|
10,000,000 |
|
|
|
0.65 |
|
|
|
|
|
| $0.065 |
|
|
769,231 |
|
|
|
2.39 |
|
|
|
|
|
| $0.0575 |
|
|
869,565 |
|
|
|
2.68 |
|
|
|
|
|
| $0.03 |
|
|
2,500,000 |
|
|
|
3.33 |
|
|
|
|
|
| $0.026 |
|
|
1,923,077 |
|
|
|
3.91 |
|
|
|
|
|
| $0.025 |
|
|
2,000,000 |
|
|
|
2.99 |
|
|
|
|
|
| $0.018 |
|
|
1,388,889 |
|
|
|
3.83 |
|
|
|
|
|
| $0.011 |
|
|
2,272,727 |
|
|
|
4.26 |
|
|
|
|
|
| $0.01 |
|
|
2,500,000 |
|
|
|
4.66 |
|
|
|
|
|
| $0.009 |
|
|
3,333,333 |
|
|
|
4.93 |
|
|
|
|
|
| |
|
|
45,411,130 |
|
|
|
1.91 |
|
|
$ |
0.08 |
|
|