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Significant Collaboration and Licensing Agreements - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 61 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Feb. 28, 2017 | Mar. 31, 2015 | Jun. 30, 2010 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2017 | Mar. 31, 2020 | Dec. 31, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 237.1 |  | $ 138.4 |  |  |
Acquired in-process research and development |  |  |  |  |  |  | 113.1 |  |  |
Equity securities fair value |  |  |  |  | 39.4 |  |  |  | $ 39.4 | $ 55.9
Collaboration revenue |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 6.0 |  | 2.0 |  |  |
AbbVie |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payments received |  |  |  | $ 75.0 |  |  |  |  |  |
Collaborative arrangement right |  |  |  | We will be entitled to a percentage of worldwide sales of GnRH Compounds for the longer of ten years or the life of the related patent rights. |  |  |  |  |  |
Collaboration termination notice period |  |  |  | 180 days |  |  |  |  |  |
AbbVie | Development and Regulatory Milestone Payments |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Potential development and regulatory milestone payment receipts |  |  |  |  | 480.0 |  |  |  |  |
Revenues |  |  |  |  | 135.0 |  |  |  |  |
AbbVie | Commercial Milestone Payments |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Potential commercial milestone payment receipts |  |  |  | $ 50.0 |  |  |  |  |  |
B I A L |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired in-process research and development |  | $ 30.0 |  |  |  |  |  |  |  |
Potential payments for regulatory milestones |  | 40.0 |  |  |  |  |  |  |  |
Payments made for regulatory milestones |  |  |  |  | 20.0 |  |  |  | 20.0 |
Potential payments for commercial milestones |  | $ 75.0 |  |  |  |  |  |  |  |
Voyager Therapeutics | Collaboration and License Agreement |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Collaboration termination notice period | 180 days |  |  |  |  |  |  |  |  |
Upfront payments made | $ 115.0 |  |  |  |  |  |  |  |  |
Equity securities cost | $ 50.0 |  |  |  |  |  |  |  |  |
Share price | $ 11.9625 |  |  |  |  |  |  |  |  |
Equity securities fair value | $ 54.7 |  |  |  |  |  |  |  |  |
Voyager Therapeutics | Collaboration and License Agreement | IPR&D |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Acquired in-process research and development |  |  |  |  |  | $ 5.0 | $ 113.1 |  |  |
Voyager Therapeutics | Collaboration and License Agreement | Common Stock |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares owned | 4.2 |  |  |  |  |  |  |  |  |
Voyager Therapeutics | Collaboration and License Agreement | Development, Regulatory and Commercial Milestone Payment |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Potential milestone payments | $ 1,700.0 |  |  |  |  |  |  |  |  |
Xenon | Collaboration and License Agreement |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payments made |  |  |  |  |  |  |  |  |  | 30.0
Equity securities cost |  |  |  |  |  |  |  |  |  | $ 20.0
Share price |  |  |  |  |  |  |  |  |  | $ 14.196
Xenon | Collaboration and License Agreement | Common Stock |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares owned |  |  |  |  |  |  |  |  |  | 1.4
Xenon | Collaboration and License Agreement | Development, Regulatory and Commercial Milestone Payment |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Potential milestone payments |  |  |  |  |  |  |  |  |  | $ 1,700.0
Mitsubishi Tanabe |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Upfront payments received |  |  | $ 30.0 |  |  |  |  |  |  |
Patent rights period |  |  | the longer of ten years or the life of the related patent rights. |  |  |  |  |  |  |
Collaboration termination notice period |  |  | 180 days |  |  |  |  |  |  |
Potential milestone payment receipts |  |  | $ 85.0 |  |  |  |  |  |  |
Deferred revenue |  |  |  |  | 8.1 |  |  |  | 8.1 |
Deferred revenue recognized |  |  |  |  | $ 1.3 |  |  |  |  |
Mitsubishi Tanabe | Collaboration revenue |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 21.9 |
Mitsubishi Tanabe | Development and Regulatory Milestone Payments | Collaboration revenue |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 15.0 |  |

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