Quarterly report pursuant to Section 13 or 15(d)

Private Warrant Exchange - Additional Information (Detail)

v3.20.2
Private Warrant Exchange - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 17, 2020
Aug. 31, 2020
Aug. 31, 2019
May 31, 2020
Nov. 30, 2019
Equity and Equity Units Offering Disclosure [Line Items]          
Exercise price of warrants, per share         $ 0.45
Common stock, par value   $ 0.001   $ 0.001  
Proceeds From Exercise Of Warrants   $ 13,469 $ 1,754    
Private Warrant Exchange [Member]          
Equity and Equity Units Offering Disclosure [Line Items]          
Common stock, par value $ 0.001        
Proceeds From Exercise Of Warrants $ 7,400        
Inducement Interest Expense $ 3,300        
Warrants Outstanding 16,543,539        
Deferred offering costs $ 400        
Private Warrant Exchange [Member] | Maximum [Member]          
Equity and Equity Units Offering Disclosure [Line Items]          
Exercise price of warrants, per share $ 1.35        
Share Price 0.70        
Private Warrant Exchange [Member] | Minimum [Member]          
Equity and Equity Units Offering Disclosure [Line Items]          
Exercise price of warrants, per share 0.35        
Share Price $ 0.21        
Private Warrant Exchange [Member] | Actual Shares [Member]          
Equity and Equity Units Offering Disclosure [Line Items]          
Stock Issued During Period, Shares, Warrant Exercised 16,543,539