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Recent Transactions, Asset Acquisition and Deconsolidation of Subsidiaries (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2023 | Jul. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023
Deconsolidation of Subsidiaries [Abstract] |  |  |  |  |  |  |
Gain on deconsolidation of subsidiaries |  |  | $ 0 | $ 12,514 | $ 17,354 | $ 29,276 |
Retained investment |  |  | $ 239,927 |  | 239,927 |  | $ 304,317
Newly-Formed Subsidiary [Member] |  |  |  |  |  |  |
Asset Acquisition [Abstract] |  |  |  |  |  |  |
Upfront cash payment |  | $ 14,000 |  |  |  |  |
Acquired in process research and development expense |  |  |  |  | 14,000 |  |
Newly-Formed Subsidiary [Member] | Maximum [Member] |  |  |  |  |  |  |
Asset Acquisition [Abstract] |  |  |  |  |  |  |
Milestone payment payable |  | 280,000 |  |  |  |  |
SK Biopharmaceuticals Co Ltd [Member] | Proteovant [Member] |  |  |  |  |  |  |
Deconsolidation of Subsidiaries [Abstract] |  |  |  |  |  |  |
Purchase of equity | $ 47,500 |  |  |  |  |  |
VantAI Preferred Financing [Member] |  |  |  |  |  |  |
Deconsolidation of Subsidiaries [Abstract] |  |  |  |  |  |  |
Gain on deconsolidation of subsidiaries |  |  |  |  | $ 17,400 |  |
Retained investment |  | 9,000 |  |  |  |  |
VantAI Preferred Financing [Member] | SK, Inc. [Member] |  |  |  |  |  |  |
Deconsolidation of Subsidiaries [Abstract] |  |  |  |  |  |  |
Contributions from issuance of shares |  | $ 6,000 |  |  |  |  |

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