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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