Quarterly report pursuant to Section 13 or 15(d)

Reconciliation of Liability Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail)

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Reconciliation of Liability Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Nov. 30, 2018
May 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value adjustments $ 466,412 $ (3,855,468)
Ending Balance 3,075,142 1,323,732
Investor Warrants Issued with Registered Direct Equity Offering    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Warrants issued   4,360,000
Placement Agent Warrants Issued with Registered Direct Equity Offering    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Warrants issued   $ 819,200
Inception Date Value of Redemption Provision    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Warrants issued $ 1,284,998