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6. BALANCE SHEET DETAIL (Details 2) - USD ($)
$ in Thousands
May 31, 2019
May 31, 2018
May 31, 2017
Accrued Liabilities [Abstract]      
Payroll related $ 990 $ 1,014  
Restructuring 408 0  
Commissions and bonuses 168 101  
Professional services 162 163  
Warranty 154 135 $ 113
Material purchases 65 0  
Taxes payable 29 34  
Investor relations 19 19  
Accrued interest 0 139  
Other 39 41  
Accrued expenses $ 2,034 $ 1,646