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Subsidiary Notes Payable - Narrative - Convertible Notes (Details) - Subsidiary convertible notes - USD ($) $ in Millions |  | 1 Months Ended | 8 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2020 | Mar. 31, 2022 | Nov. 24, 2021 | Dec. 31, 2022
Vedanta | Investor |  |  |  |
Convertible Notes [Line Items] |  |  |  |
Proceeds from issue of convertible notes | $ 25.0 |  |  |
Borrowings, interest rate | 6.00% |  |  |
Sonde |  |  |  |
Convertible Notes [Line Items] |  |  |  |
Borrowings, interest rate |  |  |  | 6.00%
Discount, conversion from notes - qualified financing |  |  |  | 20.00%
Discount, conversion from notes - non qualified financing |  |  |  | 20.00%
Sonde | Outside investors |  |  |  |
Convertible Notes [Line Items] |  |  |  |
Proceeds from issue of convertible notes |  | $ 0.4 | $ 2.2 |
Sonde | PureTech and third-party |  |  |  |
Convertible Notes [Line Items] |  |  |  |
Proceeds from issue of convertible notes |  | 0.9 | 4.3 |
Sonde | PureTech Health (Company) |  |  |  |
Convertible Notes [Line Items] |  |  |  |
Proceeds from issue of convertible notes |  | $ 0.5 | $ 2.1 |

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