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Warrants - Additional Information (Details)
 12 Months Ended
May 31, 2022
USD ($)
yr
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Class of warrant expired | shares 5,994,651
Class of warrants outstanding, original exercise price $ 5.95
Class of warrants outstanding | shares 6,209,000
Warrant expiry date Mar. 17, 2025
Reduction in exercise price of warrants $ 4.30
Daily cash penalty 1.00%
Level 3  
Class Of Warrant Or Right [Line Items]  
Estimated fair value of warrant liability per warrant $ 2.30
Expected Term  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input | yr 3.3
Warrant | Risk-Free Interest Rate | Level 3  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input 2.89
Warrant | Expected Volatility | Level 3  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input 70
Warrant | Expected Term | Level 3  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input | yr 3.3
Warrant | Strike Price | Level 3  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input | $ 4.30
Warrant | Fair Value of Common Stock | Level 3  
Class Of Warrant Or Right [Line Items]  
Warrants and Rights Outstanding, Measurement Input | $ 4.49
Minimum  
Class Of Warrant Or Right [Line Items]  
Class of warrant expired, exercise price $ 3.08
Class of warrants outstanding, original exercise price 4.30
Maximum  
Class Of Warrant Or Right [Line Items]  
Class of warrant expired, exercise price 9.08
Class of warrants outstanding, original exercise price $ 5.95