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Debt facility (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2020
Jul. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Feb. 29, 2020
Feb. 28, 2019
Jan. 30, 2018
Jan. 30, 2017
Debt Instrument [Line Items]                    
Number of Securities Called by Warrants or Rights             1,401,836      
Principal outstanding             $ 22,000 $ 20,000    
Interest Rate 8.00%                  
Debt issuance cost             1,129 800    
Accrued interest payable in kind             273      
Proceeds under our term loan         $ 51,166 $ 1,660 1,660 3,000    
Term Loan                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                   $ 20,000
Maximum Borrowing Capacity $ 24,500 $ 22,000               20,000
Principal outstanding   $ 22,000         $ 22,000 20,000    
Interest Rate   10.00% 11.75%   11.75%   11.75%      
Debt issuance cost             $ 634      
Debt discount             429      
Line of Credit Facility, Additional Borrowing Capacity $ 2,500 $ 2,000                
Interest Payable in Kind Accrued Rate 4.50% 2.00%                
Debt instrument exit fee   1.00%                
Accrued interest payable in kind             273      
Interest Expense, Debt     $ 2,043 $ 647 $ 2,837 1,316 2,858 2,844    
Amortization of Debt Issuance Costs and Discounts             $ 280 291    
Proceeds under our term loan $ 2,500                  
Term Loan | Prepayment of Loan Occur on or Before December 31, 2020                    
Debt Instrument [Line Items]                    
Debt instrument exit fee 2.00%                  
Term Loan | Prepayment of Loan Occur on or After December 31, 2020                    
Debt Instrument [Line Items]                    
Debt instrument exit fee 0.50%                  
Revolving Credit Facility, 2017                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                   $ 20,000
Number of Securities Called by Warrants or Rights             22,288   11,144 11,144
Maximum Borrowing Capacity             $ 20,000 0    
Debt issuance cost             61      
Revolving Credit Facility, 2019                    
Debt Instrument [Line Items]                    
Number of Securities Called by Warrants or Rights   135,594                
Maximum Borrowing Capacity   $ 50,000 80,000   80,000   80,000      
Principal outstanding     48,666   48,666          
Debt issuance cost     543   543   543      
Line of Credit Facility, Additional Borrowing Capacity   $ 30,000                
Interest Expense, Debt     $ 323 $ 65 $ 880 $ 71 273 72    
Amortization of Debt Issuance Costs and Discounts             $ 195 $ 31    
Term Loan Warrants                    
Debt Instrument [Line Items]                    
Number of Securities Called by Warrants or Rights             43,542      
Exercise price of warrants             $ 0.005      
Vesting percentage             100.00%      
Term of warrants             10 years      
Fair value of the warrants             $ 182