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Long-term debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]      
Borrowing option to prepay subject to minimum debt outstanding $ 5.0 $ 5.0  
End term charge rate 5.00% 5.00%  
Additional interest rate event of default 5.00% 5.00%  
Prepayment occurs in first year      
Debt Instrument [Line Items]      
Prepayment rate 2.00% 2.00%  
Prepayment occurs in second year      
Debt Instrument [Line Items]      
Prepayment rate 1.50% 1.50%  
Prepayment occurs after year two      
Debt Instrument [Line Items]      
Debt instrument stated percentage 1.00% 1.00%  
Prime Rate      
Debt Instrument [Line Items]      
Debt instrument stated percentage 8.85% 8.85%  
Basis spread variable rate   5.60%  
Initial Term Loan      
Debt Instrument [Line Items]      
Fees and transaction costs $ 0.6 $ 0.6  
Debt instrument effective percentage 11.40% 11.40%  
Interest expense $ 0.8 $ 1.3  
Loan and Security Agreement | Term Loan      
Debt Instrument [Line Items]      
Maximum borrowing     $ 40.0
Loan and Security Agreement | Initial Term Loan      
Debt Instrument [Line Items]      
Term loan     15.0
Loan and Security Agreement | Additional Term Loan One      
Debt Instrument [Line Items]      
Term loan     15.0
Loan and Security Agreement | Additional Term Loan Two      
Debt Instrument [Line Items]      
Term loan     $ 10.0