Annual report pursuant to Section 13 and 15(d)

Acquisition of Patents and Intangibles - Amortization Expense (Detail)

v3.21.2
Acquisition of Patents and Intangibles - Amortization Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 1,800 $ 2,000 $ 1,200
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2022 669    
2023 384    
2024 85    
2025 85    
Thereafter 430    
Total amortizable intangible assets, net $ 1,653 $ 13,456