Quarterly report pursuant to Section 13 or 15(d)

Derivative Liabilities - Fair Value of Convertible Note Redemption Provision (Details)

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Derivative Liabilities - Fair Value of Convertible Note Redemption Provision (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 30, 2019
Nov. 15, 2018
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
May 31, 2019
Derivative [Line Items]              
Net Proceeds         $ 50,000,000    
Change in fair value of derivative liability       $ (2,934,000)   $ (2,105,000)  
Redemption Provision Embedded Derivative              
Derivative [Line Items]              
Derivative Liability             $ 2,005,000
Change in fair value of derivative liability     $ 0   $ 0 $ 2,000,000.0  
Long Term Convertible Note Issued January 2019 | Redemption Provision Embedded Derivative              
Derivative [Line Items]              
Net Proceeds $ 5,000,000            
Derivative Liability $ 1,465,000           1,158,000
Long Term Convertible Note Issued June 2018 [Member] | Redemption Provision Embedded Derivative              
Derivative [Line Items]              
Net Proceeds   $ 5,000,000          
Derivative Liability   $ 1,285,000         $ 847,000