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Debt facility (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2020
May 31, 2020
Jul. 31, 2019
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Nov. 06, 2020
Jun. 29, 2020
Feb. 28, 2017
Jan. 30, 2017
Debt Instrument [Line Items]                    
Outstanding borrowings         $ 22,000          
Debt issuance cost         1,129          
Accrued interest payable in kind         273          
Repayment of accrued interest in kind       $ 2,252 834 $ 425        
Proceeds under our term loan       $ 51,166 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
Interest Rate   8.00% 10.00% 11.75%            
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%              
Interest Expense, Debt       $ 2,837 2,858 2,844        
Amortization of Debt Issuance Costs and Discounts       1,045 280 291        
Repayment of principal portion of debt $ 24,500                  
Repayment of accrued interest in kind 600                  
Debt instrument end charges 251     251            
Debt instrument prepayment fee $ 502     502            
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]                    
Maximum Borrowing Capacity                 $ 20,000  
Debt issuance cost                 $ 61  
Revolving Credit Facility, 2019                    
Debt Instrument [Line Items]                    
Maximum Borrowing Capacity     $ 50,000       $ 80,000      
Debt issuance cost       543            
Line of Credit Facility, Additional Borrowing Capacity     $ 30,000              
Interest Expense, Debt       1,106 273 72        
Amortization of Debt Issuance Costs and Discounts       $ 279 $ 195 $ 31        
Term Loan Warrants                    
Debt Instrument [Line Items]                    
Number of Securities Called by Warrants or Rights               86,600