Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Patents and Intangibles - Amortization Expense (Detail)

v3.21.4
Acquisition of Patents and Intangibles - Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2021
Feb. 28, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
May 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]            
Amortization expense $ 200   $ 500 $ 500 $ 1,000  
Intangible asset impairment charge   $ 10,000        
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]            
2022 (6 months remaining) 221     221    
2023 217     217    
2024 85     85    
2025 85     85    
Thereafter 545     545    
Total amortizable intangible assets, net $ 1,153     $ 1,153   $ 1,653