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Long-term debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 15, 2022
Mar. 15, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 10, 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 second year                
Debt Instrument [Line Items]                
Prepayment rate     1.50%   1.50%      
Prepayment occurs after year two                
Debt Instrument [Line Items]                
Prepayment rate     1.00%   1.00%      
Second Amendment to LSA                
Debt Instrument [Line Items]                
Debt instrument stated percentage 8.05%              
Second Amendment to LSA | Prime Rate                
Debt Instrument [Line Items]                
Basis spread variable rate 4.55%              
Second Amendment to LSA | Maximum                
Debt Instrument [Line Items]                
Term loan $ 45.0              
Debt instrument stated percentage 9.05%              
Term Loan                
Debt Instrument [Line Items]                
Maximum borrowing $ 75.0              
Initial Term Loan                
Debt Instrument [Line Items]                
Fees and transaction costs               $ 0.6
Debt instrument effective percentage     10.80%   10.80%      
Interest expense     $ 0.8 $ 0.8 $ 2.5 $ 2.1    
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 15.0
Additional term loan expired unexercised.   $ 10.0            
Loan and Security Agreement | Additional Term Loan Two                
Debt Instrument [Line Items]                
Term loan               $ 10.0