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Collaboration and License Agreements - Sarepta Therapeutics, Inc. (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 14, 2025 USD ($) | Feb. 07, 2025 USD ($) | Nov. 25, 2024 USD ($) program obligation | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2024 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  | $ 542,709 | $ 0 | $ 545,209 | $ 3,551 |
Accounts receivable |  |  |  | 2,365 |  | 2,365 |  | $ 0
Contract liabilities included in deferred revenue |  |  |  | 43,268 |  | 43,268 |  | $ 0
Sarepta |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 542,700 |  |
Accounts receivable |  |  |  | 2,400 |  | 2,400 |  |
Contract liabilities included in deferred revenue |  |  |  | $ 43,300 |  | 43,300 |  |
Sarepta | Sarepta Collaboration Agreement |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Number of performance obligations | obligation |  |  | 17 |  |  |  |  |
Upfront payment | $ 500,000 |  |  |  |  | 500,000 |  |
Proceeds from sale of stock |  | $ 325,000 |  |  |  |  |  |
Equity premium |  | $ 83,600 |  |  |  | 83,612 |  |
Annual fees |  |  | $ 250,000 |  |  | 250,000 |  |
Annual installment |  |  | $ 50,000 |  |  |  |  |
Annual installments period |  |  | 5 years |  |  |  |  |
Fixed consideration |  |  |  |  |  | 833,612 |  |
Total transaction price |  |  |  |  |  | $ 904,855 |  |
Enrollment related milestone payments |  |  | $ 300,000 |  |  |  |  |
Number of collaboration programs | program |  |  | 13 |  |  |  |  |
Collaboration agreement termination notice period prior to any regulatory approval of a licensed product |  |  | 30 days |  |  |  |  |
Sarepta | Sarepta Collaboration Agreement | Maximum |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Number of new target programs | program |  |  | 6 |  |  |  |  |
Regulatory milestone payments |  |  | $ 180,000 |  |  |  |  |
Sales-related milestone payments |  |  | 700,000 |  |  |  |  |
Sarepta | Sarepta Collaboration Agreement | Minimum |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Regulatory milestone payments |  |  | 110,000 |  |  |  |  |
Sales-related milestone payments |  |  | $ 500,000 |  |  |  |  |

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