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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 |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |

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