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Nature of Business - Additional Information (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
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Jun. 14, 2023 USD ($) | May 16, 2023 USD ($) | May 14, 2023 USD ($) | Apr. 14, 2023 USD ($) | Apr. 10, 2023 USD ($) | Mar. 24, 2023 USD ($) | Mar. 14, 2023 Days $ / shares | Feb. 22, 2023 USD ($) | Feb. 21, 2023 USD ($) | Apr. 30, 2023 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) ft² ClinicalTrial | Mar. 31, 2022 USD ($) | May 22, 2023 USD ($) | Dec. 31, 2022 USD ($)
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of incorporation |  |  |  |  |  |  |  |  |  |  |  | Aug. 24, 2018 |  |  |
Percentage of reduction in workforce |  |  |  |  |  |  |  |  |  |  |  | 0.33% |  |  |
Number of clinical trials | ClinicalTrial |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Area of building | ft² |  |  |  |  |  |  |  |  |  |  |  | 147,215 |  |  |
Net operating loss |  |  |  |  |  |  |  |  |  |  |  | $ (63,870,000) | $ (41,614,000) |  |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  |  | (14,995,000) | (34,253,000) |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  | 709,513,000 |  |  | $ 645,496,000
Debt principal balance |  |  |  |  |  |  |  |  |  |  |  | 30,945,000 |  |  | $ 37,603,000
Unrestricted cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  | 5,700,000 |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 |  |
Forecast | IPR&D Asset | Cell Therapy Clinical Trial Update |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | $ 89,100,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument payment |  |  |  |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing Bid Price per Share of Common Stock | $ / shares |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |
Consecutive business days | Days |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |
Minimum bid price requirement compliance period |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |
Pre-Paid Advance Agreement | Yorkville |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal balance |  |  |  |  |  |  |  |  |  |  |  | $ 32,400,000 |  |  |
Amount of monthly repayment |  |  |  |  |  |  |  | $ 6,000,000 | $ 6,500,000 |  |  |  |  |  |
Debt instrument payment |  |  |  |  |  | $ 1,950,000 |  |  |  |  |  |  |  |  |
Percentage of premium principal amount |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  | 5.00% |  |  |
Pre-Paid Advance Agreement | Yorkville | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument payment | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-Paid Advance Agreement | Yorkville | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Organization And Business Operations Details [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,800,000 |
Debt instrument payment |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Payment Remaining Balance |  |  | $ 6,500,000 | $ 4,600,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |
Share price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |
Debt Instrument Payment Partial Payment |  |  |  |  | $ 900,000 |  |  |  |  | $ 900,000 |  |  |  |  |
Debt instrument remaining amount repayment |  |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |

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