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Debt facility - Warrant Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 20, 2018
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Feb. 29, 2020
Feb. 28, 2019
Jul. 31, 2019
Jan. 30, 2018
Jan. 30, 2017
Debt Instrument [Line Items]                    
Long-term Debt           $ 21,144 $ 19,200      
Number of Securities Called by Warrants or Rights           1,401,836        
Debt issuance cost           $ 1,129 800      
Long-term Line of Credit   $ 1,334   $ 1,334   1,334        
Other Assets                    
Debt Instrument [Line Items]                    
Debt Issuance Costs, Net   233 $ 512 233 $ 512 372 23      
Revolving Credit Facility, 2017                    
Debt Instrument [Line Items]                    
Maximum Borrowing Capacity           $ 20,000 0      
Minimum funds raised $ 45,000                  
Number of Securities Called by Warrants or Rights           22,288     11,144 11,144
Debt issuance cost           $ 61        
Term of debt           24 months        
Revolving Credit Facility, 2019                    
Debt Instrument [Line Items]                    
Maximum Borrowing Capacity   80,000   80,000   $ 80,000   $ 50,000    
Additional Borrowing Capacity               $ 30,000    
Long-term Debt   0   0   48,666        
Number of Securities Called by Warrants or Rights               135,594    
Debt issuance cost   543   $ 543   $ 543        
Term of debt       24 months   24 months        
Extension term of debt       12 months   12 months        
Interest Expense, Debt   $ 323 $ 65 $ 880 $ 71 $ 273 72      
Amortization of Debt Issuance Costs and Discounts           $ 195 $ 31      
Lending Institution Prime Reference Rate | Revolving Credit Facility, 2017                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           1.00%        
LIBOR | Revolving Credit Facility, 2017                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           2.50%        
London Interbank Offered Rate | Revolving Credit Facility, 2019                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate       3.50%   3.50%        
Base Rate | Revolving Credit Facility, 2019                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate       2.50%   2.50%