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Long-term debt and other borrowings (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Mar. 31, 2021
USD ($)
shares
$ / shares
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2018
USD ($)
May 11, 2022
Jul. 31, 2021
$ / shares
Feb. 28, 2021
May 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
tranche
Jun. 30, 2019
Mar. 31, 2019
USD ($)
Jun. 30, 2018
Debt Instrument                            
Principal payments on long-term debt       $ 4,086,000 $ 1,000,000                  
Proceeds from financing arrangements       $ 9,407,000 $ 0                  
IPO                            
Debt Instrument                            
Issuance price (usd per share) | $ / shares   $ 16.00           $ 16.00            
2021 Notes | Convertible promissory notes                            
Debt Instrument                            
Interest rate (percent)   6.00%                        
Principal amount   $ 125,000,000                        
Discount on offering price (percent)   18.00%                        
Shares issued upon conversion of convertible debt (shares) | shares   9,732,593                        
Line of Credit | LSA                            
Debt Instrument                            
Number of tranches | tranche                     3      
Maximum borrowing capacity                     $ 3,000,000      
Proceeds from issuance of long-term debt           $ 300,000                
Interest rate (percent)                           6.00%
Prepayment premium (percent)             0.00%   1.00%          
Final payment percentage as a portion of principal amount funded (percent)                       3.00%    
Liquidity event fee (percent)                           3.50%
Principal payments on long-term debt $ 2,400,000                          
Line of Credit | LSA, First Amendment                            
Debt Instrument                            
Maximum borrowing capacity                         $ 3,000,000  
Line of Credit | LSA, Second Amendment                            
Debt Instrument                            
Maximum borrowing capacity                   $ 5,000,000        
Secured Debt | Equipment Financing                            
Debt Instrument                            
Proceeds from financing arrangements     $ 9,400,000                      
Secured Debt | Equipment Financing | Minimum                            
Debt Instrument                            
Debt instrument term (years)     42 months                      
Imputed interest rate (percent) 8.00%   8.00%                      
Secured Debt | Equipment Financing | Maximum                            
Debt Instrument                            
Debt instrument term (years)     48 months                      
Imputed interest rate (percent) 10.00%   10.00%