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Notes Payable, Preferred Stock and Stock Purchase Warrants - Convertible Preferred Stock and Warrants (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 13, 2023 | Aug. 09, 2020 | Dec. 31, 2023
PHC Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Original debt conversion amount |  |  | $ 0 |
Gain (Loss) on extinguishment of debt | $ 48,600,000 |  |  | $ 100,000
PHC Purchase Warrant |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Exercise price of warrant (in dollars per share) |  | $ 0.001 |  |
PHC Purchase Warrant | PHC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warrants to purchase shares |  | 15,425,750 |  |
Exercise price of warrant (in dollars per share) |  | $ 0.001 |  |
Aggregate gross proceeds |  | $ 15,000,000.0 |  |
Warrants fair value |  | 14,300,000 |  |
Additional paid-in-capital |  | $ 700,000 |  |
PHC Exchange Warrant |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warrants to purchase shares |  | 68,525,311 |  |
Exercise price of warrant (in dollars per share) |  | $ 0.001 |  |
Warrants fair value | $ 48,600,000 |  |  |
Interest payments |  | $ 675,000 |  |
PHC Exchange Warrant | PHC Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Original debt conversion amount |  | $ 35,000,000.0 |  |

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