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Nature of Business (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended | 168 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022
Nature of Business |  |  |  |  |
Proceeds from issuance of preferred stock | $ 9,189 | $ 3,499 | $ 13,499 | $ 51,900 | $ 113,796
Proceeds from issuance of common stock |  |  |  |  | 458
Proceeds from issuance of convertible notes and warrants |  |  |  | 45 | 57,466
Cumulative net losses |  |  |  |  | 186,358
Proceeds from issuance of exercise of stock option | 94 | $ 73 | 94 |  |
Cash, cash equivalents and restricted cash |  |  | 9,664 |  | 9,664
Accumulated deficit | $ 212,867 |  | $ 186,358 | $ 136,342 | $ 186,358

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