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Significant Collaboration and Licensing Agreements - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2015 | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Revenues |  |  | $ 236.6 | $ 237.1
Takeda | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payments |  |  | 1,900.0 |
Idorsia | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payments |  |  | 1,700.0 |
Xenon | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payments |  |  | 1,700.0 |
Voyager | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payments |  |  | 1,300.0 |
B I A L | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payments |  |  | 75.0 |
Mitsubishi Tanabe | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Deferred revenue, balance |  |  | 5.7 |
Upfront payments received | $ 30.0 |  |  |
Potential milestone payment receipts |  |  | 70.0 |
Mitsubishi Tanabe | Collaborative Arrangement | Royalty | Forecast |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Revenues |  | $ 15.0 |  |
Mitsubishi Tanabe | Collaborative Arrangement | License |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Revenues |  |  | 1.1 | 1.3
AbbVie | Collaborative Arrangement |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Potential milestone payment receipts |  |  | 366.0 |
AbbVie | Collaborative Arrangement | Royalty |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Revenues |  |  | $ 4.5 | $ 4.7

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