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Debt - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 27 Months Ended
Jun. 30, 2025
USD ($)
installment
May 31, 2024
Feb. 28, 2023
installment
Sep. 30, 2020
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
May 01, 2024
Mar. 01, 2023
Jan. 31, 2023
Dec. 31, 2022
Sep. 24, 2020
USD ($)
shares
Debt Instrument [Line Items]                              
Principal payment number of installment | installment     1                        
Amortization of debt discount and issuance costs             $ 174,000 $ 179,000              
Loss on extinguishment             $ 527,000 0              
CRG Term Loan Agreement                              
Debt Instrument [Line Items]                              
Face amount       $ 60,000,000.0                      
Proceeds from long term debt       50,000,000.0                      
Unused borrowing capacity       $ 10,000,000.0                      
Interest rate     12.50% 12.50%               13.50%      
Effective percentage     15.70%                 16.80%      
Final maturity extension period   1 year                          
Redemption fee, percent         8.00%   8.00%       10.00%        
Minimum annual net revenue                 $ 45,000,000            
Backend fee $ 4,500,000                            
Amortization of debt discount and issuance costs         $ 0 $ 100,000 $ 100,000 200,000              
Interest expense 1,400,000       $ 0 $ 2,200,000 $ 3,700,000 $ 6,600,000              
Repayment of debt 61,900,000                            
Principal 56,000,000.0                            
Loss on extinguishment 500,000                            
CRG Term Loan Agreement | Series B Redeemable Convertible Preferred Stock                              
Debt Instrument [Line Items]                              
Backend fee       $ 1,000,000.0                      
Warrants outstanding (in shares) | shares                             346,823
Warrant liability, noncurrent                             $ 600,000
CRG Term Loan Agreement | Payment In Cash                              
Debt Instrument [Line Items]                              
Interest rate                         8.50% 7.50%  
CRG Term Loan Agreement | Payment in Kind (PIK) Note                              
Debt Instrument [Line Items]                              
Interest rate                         5.00% 5.00%  
PIK increase to principal                   $ 6,000,000.0          
MidCap Agreement | Revolver                              
Debt Instrument [Line Items]                              
Aggregate principal amount $ 15,000,000                            
MidCap Agreement | Mid Term Note                              
Debt Instrument [Line Items]                              
Effective percentage         11.50%   11.50%                
Principal payment number of installment | installment 1                            
Backend fee $ 1,400,000                            
Amortization of debt discount and issuance costs         $ 100,000   $ 200,000                
Interest expense         $ 1,600,000   $ 2,100,000                
Provision for term loan facility $ 60,000,000                            
Prepayment fee, percent 0.02                            
Annual administrative fee payable, percent 0.0025                            
MidCap Agreement | Mid Term Note | Revolver                              
Debt Instrument [Line Items]                              
Unused line fee payable, percent 0.25%                            
MidCap Agreement | Mid Term Note | First Year                              
Debt Instrument [Line Items]                              
Prepayment fee, percent 0.030                            
MidCap Agreement | Mid Term Note | Second Year                              
Debt Instrument [Line Items]                              
Prepayment fee, percent 0.020                            
MidCap Agreement | Mid Term Note | Third Year                              
Debt Instrument [Line Items]                              
Prepayment fee, percent 0.010                            
MidCap Agreement | Mid Term Note | Thereafter                              
Debt Instrument [Line Items]                              
Prepayment fee, percent 0                            
MidCap Agreement | Mid Term Note | SOFR Rate                              
Debt Instrument [Line Items]                              
Interest at floating rate 5.50%                            
MidCap Agreement | Mid Term Note | SOFR Rate | Revolver                              
Debt Instrument [Line Items]                              
Interest at floating rate 3.75%                            
MidCap Agreement | Mid Term Note | SOFR Floor                              
Debt Instrument [Line Items]                              
Interest at floating rate 2.00%                            
MidCap Agreement | Mid Term Note | SOFR Floor | Revolver                              
Debt Instrument [Line Items]                              
Interest at floating rate 2.00%