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Consolidated Statements of Stockholders' Equity - USD ($) | Direct Offering [Member] Common Stock [Member] | Direct Offering [Member] Additional Paid-in Capital [Member] | Direct Offering [Member] Share Issuance Obligation [Member] | Direct Offering [Member] Retained Earnings [Member] | Direct Offering [Member] AOCI Attributable to Parent [Member] | Direct Offering [Member] | At-the-market Offering [Member] Common Stock [Member] | At-the-market Offering [Member] Additional Paid-in Capital [Member] | At-the-market Offering [Member] Share Issuance Obligation [Member] | At-the-market Offering [Member] Retained Earnings [Member] | At-the-market Offering [Member] AOCI Attributable to Parent [Member] | At-the-market Offering [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Share Issuance Obligation [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Jul. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  | 180,896,431 |  |  |  |  |
Balance at Jul. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,896 | $ 336,047,595 | $ 187,100 | $ (262,200,784) | $ 12,461 | $ 74,227,268
Issued as anniversary fees for credit facility (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,743,462 |  |  |  |  |
Issued as anniversary fees for credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,743 | 1,398,257 |  |  |  | 1,400,000
Issued (accrued) upon vesting of RSUs and PRSUs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 105,844 |  |  |  |  |
Issued (accrued) upon vesting of RSUs and PRSUs |  |  |  |  |  |  |  |  |  |  |  |  | $ 106 | (153,307) | 103,554 |  |  | (49,647)
Common stock issued for consulting services (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 380,933 |  |  |  |  |
Common stock issued for consulting services |  |  |  |  |  |  |  |  |  |  |  |  | $ 381 | 350,696 |  |  |  | 351,077
Common stock issued under Stock Incentive Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,509,200 |  |  |  |  |
Common stock issued under Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,510 | 1,308,507 | (187,100) |  |  | 1,122,917
Amortization of stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,085,491 |  |  |  | 2,085,491
Issued for consulting services |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,733 |  |  |  | 22,733
Net loss for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,610,516) |  | (14,610,516)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (132,705) | (132,705)
Balance (in shares) at Jul. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  | 184,635,870 |  |  |  |  |
Balance at Jul. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  | $ 184,636 | 341,059,972 | 103,554 | (276,811,300) | (120,244) | 64,416,618
Issued as anniversary fees for credit facility (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,249,039 |  |  |  |  |
Issued as anniversary fees for credit facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,249 | 1,168,751 |  |  |  | 1,170,000
Issued (accrued) upon vesting of RSUs and PRSUs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 536,361 |  |  |  |  |
Issued (accrued) upon vesting of RSUs and PRSUs |  |  |  |  |  |  |  |  |  |  |  |  | $ 536 | (1,255,018) | 256,006 |  |  | (998,476)
Common stock issued for consulting services (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 312,302 |  |  |  |  |
Common stock issued for consulting services |  |  |  |  |  |  |  |  |  |  |  |  | $ 312 | 952,327 |  |  |  | 952,639
Common stock issued under Stock Incentive Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 973,204 |  |  |  |  |
Common stock issued under Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  | $ 973 | 1,593,273 |  |  |  | 1,594,246
Amortization of stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,259,925 |  |  |  | 3,259,925
Net loss for the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,813,810) |  | (14,813,810)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 613,491 | $ 613,491
Stock issued (in shares) | 26,136,364 |  |  |  |  |  | 15,934,606 |  |  |  |  |  |  |  |  |  |  |
Stock issued | $ 26,136 | $ 52,515,300 |  |  |  | $ 52,541,436 | $ 15,935 | $ 35,218,957 |  |  |  | $ 35,234,892 |  |  |  |  |  |
Issued upon exercise of stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,326,255 |  |  |  |  | 3,326,255
Issued upon exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,327 | 1,912,668 |  |  |  | $ 1,915,995
Issued upon exercise of warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,692,865 |  |  |  |  |
Issued upon exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,693 | 3,584,598 |  |  |  | 3,588,291
Issued in connection with September 2020 Offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,518,432 |  |  |  | 1,518,432
Issued in connection with a direct offering as issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 461,465 |  |  |  | 461,465
Balance (in shares) at Jul. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  | 236,796,866 |  |  |  |  |
Balance at Jul. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  | $ 236,797 | $ 441,990,650 | $ 359,560 | $ (291,625,110) | $ 493,247 | $ 151,455,144

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