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Collaboration and License Agreements - Horizon Therapeutics Ireland DAC (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 18, 2021 USD ($) obligation bundle | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jul. 31, 2021 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Revenues |  | $ 243,231,000 | $ 138,287,000 | $ 87,992,000 |
Contract liabilities |  | 74,099,000 | 111,055,000 |  |
Horizon Therapeutics Ireland DAC | ARO-XDH |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Cash received as due under collaboration agreement |  |  |  |  | $ 40,000,000
Number of distinct performance obligations | obligation | 1 |  |  |  |
Initial transaction price | $ 40,000,000 |  |  |  |
Revenues |  | 26,700,000 | 6,700,000 |  |
Contract assets |  | 0 |  |  |
Contract liabilities |  | 6,700,000 |  |  |
Horizon Therapeutics Ireland DAC | License Agreement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Number of distinct bundle | bundle | 1 |  |  |  |
Number of distinct performance obligations | obligation | 1 |  |  |  |
Horizon Therapeutics Ireland DAC | ARO-XDH Supply Agreement |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Revenues |  | 2,500,000 | $ 0 |  |
Contract assets |  | 1,300,000 |  |  |
Contract liabilities |  | $ 0 |  |  |
Horizon Therapeutics Ireland DAC | Maximum | ARO-XDH |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Development regulatory and sales milestones payments | $ 660,000,000 |  |  |  |

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