Common Stock, Preferred Stock and Warrants - Changes in warrants outstanding issued to non-employees of the Company (Details)
|
9 Months Ended |
|
Jan. 31, 2021
USD ($)
$ / shares
shares
|
|---|
| Balance at start of period |
|
| Number of warrants | shares |
|
| Weighted average exercise price |
|
| Weighted average grant date fair value |
|
| Value if exercised | $ |
|
| Granted |
|
| Number of warrants | shares |
1,074,998
|
| Weighted average exercise price |
$ 1.50
|
| Weighted average grant date fair value |
$ 4.17
|
| Expiration Date |
5 years
|
| Value if exercised | $ |
$ 1,612,497
|
| Exercised |
|
| Number of warrants | shares |
|
| Weighted average exercise price |
|
| Weighted average grant date fair value |
|
| Value if exercised | $ |
|
| Cancelled/Expired |
|
| Number of warrants | shares |
|
| Weighted average exercise price |
|
| Weighted average grant date fair value |
|
| Value if exercised | $ |
|
| Outstanding at end of period |
|
| Number of warrants | shares |
1,074,998
|
| Weighted average exercise price |
$ 1.50
|
| Weighted average grant date fair value |
$ 4.17
|
| Expiration Date |
4 years 10 months 13 days
|
| Value if exercised | $ |
$ 1,612,497
|