Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Patents and Intangibles - Amortization Expense (Detail)

v3.21.1
Acquisition of Patents and Intangibles - Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
May 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization expense $ 500 $ 500 $ 1,500 $ 1,500  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]          
2021 (3 months remaining) 262   262    
2022 720   720    
2023 217   217    
2024 85   85    
2025 85   85    
Thereafter 546   546    
Total amortizable intangible assets, net $ 1,915   $ 1,915   $ 13,456