Annual report pursuant to Section 13 and 15(d)

Reconciliation of Federal Statutory Income Tax (Detail)

v3.20.2
Reconciliation of Federal Statutory Income Tax (Detail)
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Schedule Of Income Taxes [Line Items]      
Income tax provision at statutory rate: 21.00% 21.00% 28.60%
State income taxes net 0.00% 0.00% 0.00%
Rate change 0.00% 0.00% (34.80%)
Loss on debt extinguishment 0.00% (0.50%) 0.00%
Derivative gain (loss) (1.60%) 0.60% 1.00%
Valuation allowance release from asset acquisition 0.00% 4.80% 0.00%
Non-deductible debt issuance costs (0.10%) 0.00% (0.20%)
Non-deductible interest on convertible notes (1.20%) (0.30%) (0.10%)
Inducement interest expense (1.30%) (0.10%) (2.00%)
Other (0.30%) 0.00% (1.10%)
Miscellaneous 0.00% 0.00% (0.10%)
Current year credits generated 0.00% 0.00% 4.40%
Credit carry forward generated (released) (0.10%) (3.80%) 4.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent (0.30%) 0.00% 0.00%
Effective Income Tax Rate Reconciliation Non Deductible Expense IRC 162 limitation (2.40%) 0.00% 0.00%
Stock compensation in excess of ASC 718 3.20% 0.00% 0.00%
Non-deductible legal settlement expense (3.80%) 0.00% 0.00%
Valuation allowance (13.10%) (16.90%) 0.30%
Total 0.00% 4.80% 0.00%