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Significant Collaboration and Licensing Agreements - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 27 Months Ended | 28 Months Ended | 123 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2015 | Jun. 30, 2010 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2017 | Sep. 30, 2020 | Jul. 31, 2020 | Apr. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  | $ 258.5 |  | $ 222.1 | $ 798.0 | $ 544.0 |  |  |  |  |  |
Takeda | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payments made |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120.0 |
Potential milestone payments |  |  |  |  |  | 1,900.0 |  |  | 1,900.0 |  | $ 1,900.0 |  |  | $ 1,900.0 |  |
Idorsia | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payments made | $ 45.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental funding provided | $ 7.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research collaboration term | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential commercial milestone payments |  |  |  |  |  | 750.0 |  |  | 750.0 |  | 750.0 |  |  | 750.0 |  |
Collaboration termination notice period | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Idorsia | Collaborative Arrangement | NBI-827104 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential milestone payments |  |  |  |  |  | 365.0 |  |  | 365.0 |  | 365.0 |  |  | 365.0 |  |
Idorsia | Collaborative Arrangement | Development Product Candidates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential milestone payments |  |  |  |  |  | 620.0 |  |  | 620.0 |  | 620.0 |  |  | 620.0 |  |
Xenon | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration termination notice period |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voyager | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination notice period, before first commercial sale |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |
Termination notice period, after date of notice |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
B I A L | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential commercial milestone payments |  |  |  |  |  | 75.0 |  |  | $ 75.0 |  | 75.0 |  |  | 75.0 |  |
Milestone payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.0
Minimum sales requirement period |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Mitsubishi Tanabe | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration termination notice period |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue recognized |  |  |  |  |  | 0.5 |  |  | $ 1.8 |  | 2.6 |  |  |  |  |
Deferred revenue, balance |  |  |  |  |  | 7.6 |  |  | 7.6 |  | 7.6 |  |  | 7.6 |  |
Upfront payments received |  |  |  | $ 30.0 |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  |  |  |  |  |  |  |  | $ 15.0 | $ 19.8 |  |  |
Potential milestone payment receipts |  |  |  |  |  | 70.0 |  |  | 70.0 |  | 70.0 |  |  | 70.0 |  |
Mitsubishi Tanabe | Collaborative Arrangement | Patents | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent term |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
AbbVie | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration termination notice period |  |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  | $ 75.0 |  | $ 30.0 |  |  |  |  |  |  | 165.0 |  |
Potential milestone payment receipts |  |  |  |  |  | $ 366.0 |  |  | $ 366.0 |  | $ 366.0 |  |  | $ 366.0 |  |
AbbVie | Collaborative Arrangement | Patents | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent term |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |

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