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Summary of Quarterly Results of Operations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired in-process research and development						$ 164.5	$ 154.3	$ 4.8
Idorsia | Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired in-process research and development		$ 46.0
Takeda | Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired in-process research and development	$ 118.5
Voyager | Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired in-process research and development				$ 5.0	$ 113.1
Xenon | Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Acquired in-process research and development			$ 36.2

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- Definition

The amount of the write-off for research and development assets that were acquired in a transaction other than a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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