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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 07, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 06, 2023 | Jun. 05, 2023 | Apr. 17, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued in a pre-closing funding (in shares) | 3,730,608 |  |  |  |  |  |
Issue price per share (in USD per share) | $ 8.21 |  |  |  |  |  |
Sale of common stock under Open Market Sales Agreement, net of issuance costs | $ 30,600 |  | $ 597 |  |  |  |
Issuance of common stock upon settlement of convertible promissory note, accrued interest, and related derivative liability (in shares) | 5,059,338 |  |  |  |  |  |
Issuance of common stock upon settlement of convertible promissory note, accrued interest, and related derivative liability | $ 35,000 |  | $ 42,447 |  |  |  |
Shares issued upon conversion of convertible preferred stock and exchangeable shares previously presented as noncontrolling interests (in shares) | 18,872,711 |  |  |  |  |  |
Issuance of common stock to Sesen Bio shareholders in reverse capitalization (in shares) | 10,374,272 |  |  |  |  |  |
Stock offering, amount |  |  |  |  |  | $ 300,000 |
Common stock, par value (in USD per share) |  |  | $ 0.001 |  |  |  | $ 0.001
Common stock, shares authorized (in shares) |  |  | 350,000,000 | 350,000,000 | 100,000,000 |  | 350,000,000
Preferred stock, shares authorized (in shares) |  |  | 5,000,000 | 5,000,000 |  |  | 5,000,000
Preferred stock, par value (in USD per share) |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001
At-The-Market Offering | Jefferies LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock offering, amount |  |  |  |  |  | $ 100,000 |
Sale of stock (in shares) |  |  | 226,533 |  |  |  |
Gross proceeds |  |  | $ 600 |  |  |  |
At-The-Market Offering | Jefferies LLC | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Sale of stock (in shares) |  | 931,250 |  |  |  |  |
Gross proceeds |  | $ 2,400 |  |  |  |  |

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