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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