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Notes Payable, Preferred Stock and Stock Purchase Warrants - Convertible Notes (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 10, 2023 USD ($) shares | Mar. 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Aug. 09, 2020 USD ($) $ / shares shares | Jul. 31, 2019 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Jan. 27, 2021 USD ($) shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares | Apr. 30, 2022 | Apr. 21, 2020 USD ($)
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  |  |  |  |  |  |  | $ 41,195,000 | $ 34,448,000 |  |
Derivative liabilities |  |  |  |  |  |  |  |  | $ 102,000 |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |
PHC Notes |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 35,000,000.0 |  | $ 35,000,000.0 |  |  |  |  |  |  |  |
Conversion rate (per $1,000 of principal) |  |  |  | 1,901.7956 |  |  |  |  |  |  |  |
Amount of principal which is converted to shares |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 0.53 |  |  |  |  |  |  |  |
Gain (Loss) on extinguishment of debt |  | 48,600,000 |  |  |  |  |  |  | $ 100,000 |  |  |
Carrying Amount |  | 25,400,000 |  |  |  |  |  |  |  |  |  |
Effective interest rate (as percentage) |  |  |  | 29.19% |  |  |  | 8.00% |  |  |  |
Financing fee shares issued | shares |  |  |  | 2,941,176 |  |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Debt Discount Of Financing Fee Shares |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 9.50% |  |  |  |  |  |  | 8.00% |
Value of shares issued on conversion |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |
Fair value of the embedded conversion option |  | 0 |  | 25,800,000 |  |  |  |  |  |  |  |
Issuance costs incurred |  |  |  | 2,900,000 |  |  |  |  |  |  |  |
Debt issuance costs and discounts |  |  |  | 1,400,000 |  |  |  |  |  |  |  |
Original debt conversion amount |  |  |  | $ 0 |  |  |  |  |  |  |  |
Interest Payable |  | 23,200,000 |  |  |  |  |  |  |  |  |  |
Net gain on exchange of debt instrument |  |  |  |  |  |  |  | $ 18,800,000 |  |  |  |
PHC Notes | Debt Redemption on or After October 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock trigger |  |  |  | 275.00% |  |  |  |  |  |  |  |
Notice period |  |  |  | 10 days |  |  |  |  |  |  |  |
PHC Notes | Debt Redemption on or After October 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Notice period |  |  |  | 10 days |  |  |  |  |  |  |  |
PHC Notes | Debt Redemption Six Months Prior to Maturity Date |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Call premium percentage |  |  |  | 130.00% |  |  |  |  |  |  |  |
PHC Notes | Debt Redemption Within Six Months of Maturity Date |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Call premium percentage |  |  |  | 125.00% |  |  |  |  |  |  |  |
PHC Notes | Other income (expenses) |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of embedded derivative |  | $ 44,200,000 |  |  |  |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 30,800,000 |  |  |  | $ 82,000,000.0 |  | $ 6,800,000 |  | 20,399,000 | $ 20,399,000 |  |
Conversion rate (per $1,000 of principal) |  |  |  |  | 757.5758 |  |  |  |  |  |  |
Amount of principal which is converted to shares |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 1.32 |  |  |  |  |  |  |
Debt converted, Shares issued | shares | 35,100,000 |  |  |  |  |  | 5,152,259 |  |  |  |  |
Gain (Loss) on extinguishment of debt | $ (4,600,000) |  |  |  |  |  | $ 3,200,000 |  |  |  |  |
Converted debt amount | 7,500,000 |  |  |  |  |  |  |  |  |  |  |
Carrying Amount | $ 20,400,000 |  |  |  |  |  |  |  | 17,257,000 | 19,376,000 |  |
Derivative liabilities |  |  |  |  |  |  |  |  | 100,000 | $ 0.0 |  |
Effective interest rate (as percentage) | 15.54% |  |  |  |  |  |  | 5.25% |  | 5.25% |  |
Interest rate (as a percent) | 5.25% |  |  |  |  |  |  |  |  |  |  |
Issuance costs incurred |  |  |  |  |  |  |  |  | $ 52,000 | $ 17,000 |  |
2025 Notes | Exchange Agreement with Highbridge |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 24,000,000.0
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 53,000,000.0 |  |  |  |  |  |
Conversion rate (per $1,000 of principal) |  |  |  |  |  | 294.1176 |  |  |  |  |  |
Amount of principal which is converted to shares |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.40 |  |  |  |  |  |
Gain (Loss) on extinguishment of debt |  |  | $ 20,000.00 |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  | $ 17,300,000 |  |  |  |  |  |
Effective interest rate (as percentage) |  |  |  |  |  |  |  | 5.25% |  |  |  |
Repurchase price as a percent of principal amount |  |  |  |  |  | 100.00% |  |  |  |  |  |
Transaction costs |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |
Amortization percent |  |  |  |  |  | 9.30% |  |  |  |  |  |
Repurchase amount |  |  |  |  |  | $ 37,000,000.0 |  |  |  |  |  |

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