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6. BALANCE SHEET DETAIL (Details 2) - USD ($)
$ in Thousands
May 31, 2020
May 31, 2019
May 31, 2018
Accrued Liabilities [Abstract]      
Payroll related $ 791 $ 990  
Warranty 246 154 $ 135
Professional services 173 162  
Commissions and bonuses 139 168  
Taxes payable 30 29  
Investor relations 19 19  
Restructuring 8 408  
Material purchases 0 65  
Other 33 39  
Accrued expenses $ 1,439 $ 2,034