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License and Collaboration Agreements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Product revenues, net | $ 360,548 | $ 238,988 | $ 720,032 | $ 470,483 |
Collaboration receivable | 19,869 |  | 19,869 |  | $ 29,786
Development Milestone and Upfront Fee Recognized as Research and Development Expense | 0 | 7,600 | 0 | 8,100 |
ELEVIDYS [Member] |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Product revenues, net | 121,721 | 0 | 255,657 | 0 |
Collaborative Arrangement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Payment for option exercise |  |  | 121,800 |  |
Research, option and milestone expense | 0 |  | 0 |  |
Collaborative Arrangement | Maximum [Member] |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Contingent research milestone payments |  |  | 34,800 |  |
Development Milestone and Upfront Fee Recognized as Research and Development Expense |  |  | 2,800,000 |  |
Collaborative Arrangement | Research and Development Expense |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Up-front and development milestone expenses |  | 7,500 |  | 7,500 |
Collaborative Arrangement | Roche Holding A.G. [Member] |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Product revenues, net |  | 22,300 | 48,000 | 44,300 |
Deferred Revenue | 447,000 |  | 447,000 |  | 487,400
Deferred Revenue, Current | 122,000 |  | 122,000 |  | 50,400
Research and development expense | 17,900 | 28,200 | 39,600 | 48,500 |
Collaboration Receivable | 19,900 |  | 19,900 |  | $ 29,800
Collaborative Arrangement | Roche Holding A.G. [Member] | ELEVIDYS [Member] |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Inventory Cost |  |  | 1,700 |  |
Collaboration receivable | 5,800 | 0 | 5,800 | 0 |
Royalty revenue | $ 2,400 | $ 0 | $ 2,600 | $ 0 |

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