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Redeemable Convertible Preferred Stock and Stockholders' Equity - Narrative (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 38 Months Ended
Apr. 25, 2024
shares
Apr. 22, 2024
USD ($)
$ / shares
shares
Feb. 09, 2021
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Aug. 22, 2024
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
shares
Jun. 30, 2023
shares
Mar. 31, 2023
shares
Dec. 31, 2022
shares
May 17, 2021
USD ($)
$ / shares
shares
Class of Stock [Line Items]                              
Underwriting discounts and commissions   $ 13,200,000                          
Offering costs             $ 5,972,000 $ 4,000              
Redeemable convertible preferred stock, shares authorized (in shares) | shares   17,245,954   0     0       17,245,954        
Long-term debt, gross   $ 75,100,000   $ 0     $ 0       $ 75,099,000        
Common stock, shares authorized (in shares) | shares       0     0       40,000,000        
Common stock, par value (in usd per share) | $ / shares       $ 0.00001     $ 0.00001       $ 0.00001        
Preferred stock, shares authorized (in shares) | shares       100,000,000     100,000,000       0        
Redeemable convertible preferred stock, par value (in usd per share)       $ 0.00001     $ 0.00001       $ 0.00001        
Redeemable convertible preferred stock, shares issued (in shares) | shares       0     0       17,245,954        
Redeemable convertible preferred stock, shares outstanding (in shares) | shares       0 17,245,954 0 0 17,245,954 17,245,954   17,245,954 17,245,954 17,245,954 17,245,954  
Preferred stock, shares issued (in shares) | shares       0     0       0        
Preferred stock, shares outstanding (in shares) | shares       0     0       0        
Additional paid in capital, restricted share purchase                 $ 3,100,000            
Other current liabilities       $ 3,596,000     $ 3,596,000       $ 4,317,000        
Other long-term liabilities       8,836,000     8,836,000       3,864,000        
Warrants, exercise price (in dollars per share) | $ / shares                             $ 70.12
Warrants, increase in number of shares exercisable, percent   12.40%                          
Warrants outstanding                             $ 35,300,000
Stock-based compensation expense   $ 14,000,000.0   13,675,000 $ 10,775,000   63,337,000 $ 14,359,000              
Stock-based compensation expense yet to be recognized       52,700,000     52,700,000                
Authorized amount                   $ 100,000,000          
Repurchase of common stock       15,687,000                      
IPO                              
Class of Stock [Line Items]                              
Shares issued in transaction (in shares) | shares   2,500,000                          
Sale of stock, proceeds received, net   $ 198,000,000.0                          
Offering costs   $ 8,800,000                          
Common stock, par value (in usd per share) | $ / shares   $ 0.00001                          
Preferred stock, shares authorized (in shares) | shares   100,000,000                          
Redeemable convertible preferred stock, par value (in usd per share)   $ 0.00001                          
Secondary Offering                              
Class of Stock [Line Items]                              
Shares issued in transaction (in shares) | shares   4,060,700                          
Sale of stock, proceeds received, net   $ 0                          
Over-Allotment Option                              
Class of Stock [Line Items]                              
Shares issued in transaction (in shares) | shares 984,105                            
Convertible notes                              
Class of Stock [Line Items]                              
Long-term debt, gross       0     0       75,099,000        
Convertible notes                              
Class of Stock [Line Items]                              
Long-term debt, gross   $ 75,100,000                          
Common stock warrant                              
Class of Stock [Line Items]                              
Warrants (in shares) | shares   4,121,034                         3,528,577
Antidilutive increase in warrants outstanding (in shares) | shares   592,457                          
Warrants outstanding   $ 37,200,000                          
Warrants, Performance Conditions                              
Class of Stock [Line Items]                              
Warrants (in shares) | shares                             1,648,413
Sales and marketing                              
Class of Stock [Line Items]                              
Stock-based compensation expense       4,347,000 9,627,000   34,777,000 10,749,000              
Restricted stock purchase | Officer                              
Class of Stock [Line Items]                              
Granted (in shares) | shares     408,824                        
Granted, weighted average grant date fair value, as of beginning of period (in usd per share) | $ / shares     $ 8.30                        
Restricted stock purchase, authorized amount     $ 3,400,000                        
Vesting period     1 year                        
Restricted Stock Purchase                              
Class of Stock [Line Items]                              
Additional paid in capital, restricted share purchase           $ 2,400,000                  
Other current liabilities       300,000     300,000       $ 800,000        
Other long-term liabilities       200,000     200,000                
Warrants, Performance Conditions | Share-Based Payment Arrangement, Nonemployee                              
Class of Stock [Line Items]                              
Stock-based compensation expense yet to be recognized       $ 32,300,000     32,300,000                
Stock-based compensation yet to be recognized, weighted average period       4 years                      
Warrants, Performance Conditions | Sales and marketing | Share-Based Payment Arrangement, Nonemployee                              
Class of Stock [Line Items]                              
Stock-based compensation expense       $ 2,200,000 $ 9,100,000   $ 27,100,000 $ 9,100,000              
Common stock warrant                              
Class of Stock [Line Items]                              
Stock-based compensation expense   $ 17,500,000                          
Restricted Stock Purchase, Tranche One                              
Class of Stock [Line Items]                              
Restricted stock purchase, shares released     25.00%                        
Restricted Stock Purchase, Tranche Two                              
Class of Stock [Line Items]                              
Restricted stock purchase, shares released     2.08%                        
Restricted Stock Purchase, Tranche Two | Restricted stock purchase | Officer                              
Class of Stock [Line Items]                              
Vesting period     36 months                        
Common Class A                              
Class of Stock [Line Items]                              
Common stock, shares authorized (in shares) | shares       3,000,000,000     3,000,000,000       0        
Common stock, par value (in usd per share) | $ / shares       $ 0.00001     $ 0.00001       $ 0.00001        
Repurchase of common stock (in shares) | shares       274,902                      
Repurchase of common stock       $ 15,700,000                      
Remaining amount authorized       $ 84,400,000     $ 84,400,000                
Common Class A | IPO                              
Class of Stock [Line Items]                              
Common stock, shares authorized (in shares) | shares   3,000,000,000                          
Common Class A | Common Stock Converted to Class A Common Stock                              
Class of Stock [Line Items]                              
Common stock reclassified (in shares) | shares   9,511,741                          
Common Class A | Conversion of Class A Common Stock To Class B Common Stock                              
Class of Stock [Line Items]                              
Common stock, shares exchanged (in shares) | shares   (3,668,427)                          
Common Class A | Conversion of Convertible Debt                              
Class of Stock [Line Items]                              
Common stock reclassified (in shares) | shares   1,177,087                          
Common Class B                              
Class of Stock [Line Items]                              
Common stock, shares authorized (in shares) | shares       350,000,000     350,000,000       0        
Common stock, par value (in usd per share) | $ / shares       $ 0.00001     $ 0.00001       $ 0.00001        
Common stock, votes per share (votes)   20                          
Common Class B | IPO                              
Class of Stock [Line Items]                              
Common stock, shares authorized (in shares) | shares   350,000,000                          
Common Class B | Conversion of Class A Common Stock To Class B Common Stock                              
Class of Stock [Line Items]                              
Common stock, shares exchanged (in shares) | shares   3,668,427