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Organization, Restructuring, Going Concern and Basis of Presentation - Additional Information (Details)
$ / shares in Units, $ in Thousands
 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
May 27, 2025
May 14, 2025
Mar. 13, 2025
Feb. 12, 2024
USD ($)
Nov. 15, 2023
USD ($)
Oct. 02, 2023
USD ($)
May 25, 2023
USD ($)
Apr. 13, 2022
USD ($)
Jun. 30, 2024
USD ($)
Employee
Sep. 30, 2025
USD ($)
Location
Lease
Sublease
$ / shares
Jun. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Location
Lease
Employee
Sublease
$ / shares
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
Location
Lease
Sublease
$ / shares
Jun. 26, 2025
$ / shares
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Organization And Basis Of Presentation [Line Items]                                        
Entity incorporation, date of incorporation                         Nov. 21, 2005              
Number of leased locations subleased | Sublease                   2     2     2        
Number of leased locations | Location                   3     3     3        
Number of leases to seek early termination | Lease                   2     2     2        
Minimum required amount of stockholder equity                     $ 2,500                  
Stockholders' equity                 $ 30,977 $ (4,328) $ 1,622 $ 20,619 $ (4,328) $ 20,619 $ 11,594 $ (4,328)   $ 3,872 $ 77,504 $ 89,420
Restructuring charge                   (21)   2,804 1,262 9,254 10,900 $ 12,200        
Impairment charge for write-down of property and equipment                             1,900          
Impairment Of Right Of Use Asset                   $ 0   0 0 22,836 $ 22,800          
Fund raised for operations                         429,800              
Issuance of equity securities                         4,300              
Proceeds from repurchase of equity gross                         $ 5,000              
Reverse stock split, ratio                     0.02                  
Common stock par value | $ / shares                   $ 0.001     $ 0.001   $ 0.001 $ 0.001        
Stock exchange stock trading description                         From the May 28, 2025 date that the common stock began trading on a post-split basis on Nasdaq, the Company maintained a minimum bid price of $1.00 per common share in excess of 10 consecutive business days as required under the Bid Price Requirement, and, on June 13, 2025, Nasdaq notified the Company that it had regained compliance with the Bid Price Requirement.              
Accumulated deficit                   $ (426,758)     $ (426,758)   $ (404,790) $ (426,758)        
Cash and cash equivalents                   22,055     $ 22,055   40,577 22,055        
Number of leased properties marketed for sublease arrangements | Lease                         3              
Purchase Agreement                                        
Organization And Basis Of Presentation [Line Items]                                        
Common stock par value | $ / shares                                 $ 0.001      
Sales Agreement                                        
Organization And Basis Of Presentation [Line Items]                                        
Net proceeds       $ 4,800 $ 8,200 $ 10,900                            
Private Placement                                        
Organization And Basis Of Presentation [Line Items]                                        
Net proceeds from private placement               $ 96,300                        
Private Placement | Purchase Agreement                                        
Organization And Basis Of Presentation [Line Items]                                        
Net proceeds from private placement             $ 50,000                          
Net proceeds from issuance of preferred stock allocated to warrants             46,500                          
Private Placement | Pre Funded Warrants                                        
Organization And Basis Of Presentation [Line Items]                                        
Gross proceeds for warrant exercises               $ 21,100                        
Employee Severance                                        
Organization And Basis Of Presentation [Line Items]                                        
Number of employees reduced | Employee                 87       87              
Common Stock                                        
Organization And Basis Of Presentation [Line Items]                                        
Stockholders' equity                 $ 1 $ 2 $ 2 $ 1 $ 2 $ 1 $ 1 $ 2   $ 1 $ 1 $ 1
Reverse stock split                         As a result of the Reverse Stock Split, every 50 shares of the Company’s issued and outstanding common stock was automatically exchanged for one issued and outstanding share of common stock, without any change in the par value per share.              
Reverse stock split, ratio 0.02 0.02 0.01                                  
Reverse stock split shares issued | shares                     48   1              
Fractional shares issued | shares                         0              
Reduction of common stock fractional shares | shares                         48              
Authorized number of shares unchanged | shares                         200,000,000              
Net proceeds             $ 30,500