Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Cash Flows from Operating Activities    
Net loss $ (30,648,023) $ (23,151,431)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization (Notes 6 and 7) 407,806 654,354
Stock-based compensation expense (Note 16) 1,361,744 2,774,749
Write-down and impairment of property, plant and equipment 0 5,043,120
Accretion and accrued interest expenses (Note 19) 82,393 56,259
Loss (gain) on revaluation of foreign exchange contracts (Note 19) 0 (58,945)
Changes in operating assets and liabilities:    
Sales tax and tax credits receivable (Note 3) 948,328 (477,855)
Prepaid expenses (Note 4) (1,394,272) (1,075,291)
Accounts payable and accrued liabilities (Note 9) (3,587,932) 1,690,789
Net cash used in operating activities (32,829,956) (14,544,251)
Cash Flows from Investing Activities    
Investment in joint venture (Note 10) 0 (650,000)
Additions to property, plant and equipment (Notes 5 and 6) (5,022,255) (1,580,795)
Additions to intangible assets (Note 7) (348,017) (155,798)
Net cash used in investing activities (5,370,272) (2,386,593)
Cash Flows from Financing Activities    
Proceeds from sale of common shares and warrants, and exercise of warrants, net of share issuance costs (Note 13) 56,087,746 26,649,253
Proceeds from issuance of long-term debt (Note 11) 1,868,954 0
Repayment of long-term debt (Note 11) (41,041) (32,781)
Net cash (used) provided by financing activities 57,915,659 26,616,472
Effect of exchange rate changes (77,336) 210,516
Net increase (decrease) in cash 19,638,095 9,896,144
Cash, beginning of period 35,221,951 33,717,671
Cash, end of period 54,860,046 43,613,815
Supplemental Disclosure of Cash Flow Information:    
Income tax paid 0 0
Interest paid 30,506 28,613
Interest received $ 23,654 $ 78,394