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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 29, 2020 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2016 | Dec. 31, 2023 | Dec. 31, 2022 | May 29, 2020
Other Commitments |  |  |  |  |  |  |
Milestone payable |  | $ 2,500 | $ 32,500 |  |  |  |
Accrued royalties |  | 28,952 |  |  | $ 74,111 |  |
Wellcome Trust |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Development milestone payment obligations |  |  |  |  |  | $ 2,500 |
Milestone obligation payments made |  |  |  | $ 800 |  |  |
Censa |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Asset acquisition, development and regulatory milestones |  |  |  |  |  |  | $ 109,000
Censa | Maximum |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Asset acquisition, milestone, amount |  |  |  |  |  |  | 217,500
Asset acquisition, net sales milestone |  |  |  |  |  |  | $ 160,000
Former Censa Securityholders |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Potential developmental and regulatory milestones |  | 65,000 |  |  |  |  |
Development milestone obligation payments made |  |  | $ 30,000 |  |  |  |
Development milestone obligation cash payments made |  | $ 400 |  |  |  |  |
Shares issued for milestone payment |  | 657,462 |  |  |  |  |
SMA License Agreement | SMA Foundation |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Royalty expense since inception |  |  |  |  | 52,500 |  |
Royalty payments |  |  |  |  | 35,300 |  |
Accrued royalties |  | $ 17,200 |  |  |  |  |
SMA License Agreement | SMA Foundation | Maximum |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Potential royalty payments due on net product sales |  |  |  |  | $ 52,500 |  |
Agilis |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | 40,000 |  |  |  |  |
Potential developmental and regulatory milestones |  | 31,100 |  |  |  |  |
Potential sales milestones |  | 50,000 |  |  |  |  |
Milestone obligation payments made |  |  |  |  |  | $ 50,000 |
Development milestone obligation payments made |  | $ 2,400 |  |  |  |  |
Agilis | Minimum |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Product sales (as a percent) |  | 2.00% |  |  |  |  |
Agilis | Maximum |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 60,000 |  |  |  |  |
Priority review voucher amount |  | 535,000 |  |  |  |  |
Potential sales milestones |  | $ 150,000 |  |  |  |  |
Product sales (as a percent) |  | 6.00% |  |  |  |  |
Development milestone payment obligations, net of cancellation and forfeiture |  | $ 20,000 |  |  |  |  |
Contingent liability, milestone, potential achievements, priority review voucher amount, net of cancellation and forfeiture |  | 361,000 |  |  |  |  |
Agilis | Rights Exchange Agreement |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Contingent liability cancellation and forfeiture of potential milestone payments | $ 174,000 |  |  |  |  |  |
Development milestone payment obligations, cancellation and forfeiture | 37,600 |  |  |  |  |  |
Contingent liability, cancellation and forfeiture | $ 211,600 |  |  |  |  |  |
BioElectron | Maximum |  |  |  |  |  |  |
Other Commitments |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 200,000 |  |  |  |  |

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