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Income Taxes and Deferred Income Taxes - Summary of Reconciliation of Income Taxes at Statutory Rate with Reported Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Income Tax Disclosure [Abstract]      
Loss before net income taxes: $ (344,986) $ (109,185) $ (38,138)
Income tax benefits at statutory rate (72,408) (22,929) (8,009)
Tax impact of foreign operations (19,016) (6,310) (2,504)
Foreign exchange and other 1,011 (63) (491)
Non-deductible expenses (1,347) 2,474 5,731
Non-deductible (taxable) losses 45,230 2,152 (11,724)
Changes in enacted rates 135    
Change in fair value of warrant liability (259)    
Stock based and other compensation 2,902 4,105 14,655
Change in valuation allowance 46,007 1,066 297
Non deductible dividend (755)    
Non deductible impairment   11,153  
Effect of transaction (10,472)    
Income tax benefits, net $ (8,972) $ (8,352) $ (2,045)