Annual report pursuant to Section 13 and 15(d)

Convertible Instruments - Activity related to June 2018 Note and January 2019 Note (Detail)

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Convertible Instruments - Activity related to June 2018 Note and January 2019 Note (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2020
May 31, 2019
Jun. 26, 2018
Long term convertible note issued June 2018 and January 2019      
Debt Instrument [Line Items]      
Carrying value of Notes, Beginning balance $ 4,655    
Convertible note, aggregate principal     $ 5,700
Note amendment, net   $ 112  
Redemptions (10,746) (1,455)  
Interest accretion 6,528 298  
Extinguishment of note (437)    
Carrying value of Notes, Ending balance   4,655  
Current maturities of long term convertible notes      
Debt Instrument [Line Items]      
Carrying value of Notes, Beginning balance 4,200    
Convertible note, aggregate principal     2,100
Monthly redemption provision   2,100  
Redemptions (10,689)    
Interest accretion 6,489    
Carrying value of Notes, Ending balance   4,200  
Long term convertible notes noncurrent      
Debt Instrument [Line Items]      
Carrying value of Notes, Beginning balance 455    
Convertible note, aggregate principal     $ 3,600
Monthly redemption provision   (2,100)  
Note amendment, net   112  
Redemptions (57) (1,455)  
Interest accretion 39 298  
Extinguishment of note $ (437)    
Carrying value of Notes, Ending balance   $ 455