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Accounting Policies - Subsidiaries (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Subsidiary operating companies | Alivio Therapeutics, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 91.90%
Subsidiary operating companies | Entrega, Inc. (indirectly held through Enlight) | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 77.30% | 77.30% | 83.10%
Subsidiary operating companies | Follica, Incorporated | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 28.70% | 28.70% | 28.70%
Subsidiary operating companies | Follica, Incorporated | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 56.70% | 56.70% | 56.70%
Subsidiary operating companies | PureTech LYT (formerly Ariya Therapeutics, Inc.) | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Subsidiary operating companies | PureTech LYT-100 | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Subsidiary operating companies | PureTech Management, Inc. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Subsidiary operating companies | PureTech Health LLC | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Subsidiary operating companies | Vedanta Biosciences | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 47.00% | 48.60% | 59.30%
Subsidiary operating companies | Vedanta Biosciences Securities Corp. (indirectly held through Vedanta) | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 47.00% | 48.60% | 59.30%
Deconsolidated former subsidiary operating companies | Sonde Health, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 40.20% | 51.80% | 51.80%
Deconsolidated former subsidiary operating companies | Akili Interactive Labs, Inc. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 14.70% |  |
Deconsolidated former subsidiary operating companies | Akili Interactive Labs, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 0.00% | 26.70% | 41.90%
Deconsolidated former subsidiary operating companies | Gelesis, Inc. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 22.80% | 4.80% | 4.90%
Deconsolidated former subsidiary operating companies | Gelesis, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 0.00% | 19.70% | 20.20%
Deconsolidated former subsidiary operating companies | Karuna Therapeutics, Inc. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 3.10% | 5.60% | 12.60%
Deconsolidated former subsidiary operating companies | Vor Biopharma Inc. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 4.10% | 8.60% |
Deconsolidated former subsidiary operating companies | Vor Biopharma Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings |  | 0.00% | 16.40%
Nontrading holding companies | Endra Holdings, LLC (held indirectly through Enlight) | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 86.00% | 86.00% | 86.00%
Nontrading holding companies | Ensof Holdings, LLC (held indirectly through Enlight) | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 86.00% | 86.00% | 86.00%
Nontrading holding companies | PureTech Securities Corp. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Nontrading holding companies | PureTech Securities II Corp. | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% |
Inactive subsidiaries | Appeering Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Inactive subsidiaries | Commense Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 99.10% | 99.10% | 99.10%
Inactive subsidiaries | Enlight Biosciences, LLC | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 86.00% | 86.00% | 86.00%
Inactive subsidiaries | Ensof Biosystems, Inc. (held indirectly through Enlight) | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 57.70% | 57.70% | 57.70%
Inactive subsidiaries | Ensof Biosystems, Inc. (held indirectly through Enlight) | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 28.30% | 28.30% | 28.30%
Inactive subsidiaries | Knode Inc. (indirectly held through Enlight) | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 86.00% | 86.00% | 86.00%
Inactive subsidiaries | Libra Biosciences, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%
Inactive subsidiaries | Mandara Sciences, LLC | Common |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 98.30% | 98.30% | 98.30%
Inactive subsidiaries | Tal Medical, Inc. | Preferred |  |  |
Accounting Policies |  |  |
Voting percentage through the holdings | 100.00% | 100.00% | 100.00%

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