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Collaboration Agreements - Iconic Therapeutics, Inc. (Iconic) Collaboration (Details) - Collaboration Agreement with Iconic Therapeutics, Inc. - USD ($) $ in Millions	1 Months Ended
	May 31, 2019	Jun. 28, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payment	$ 7.5
Preclinical development funding commitment accrued		$ 5.1
Option exercise fee payment, if exercised		20.0
Maximum amount eligible for development, regulatory and first-sale milestones		190.6
Maximum amount eligible for commercial milestones under collaborations agreement		$ 262.5

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Collaborative Agreement, Maximum Amount Eligible For Commercial Milestones Under Collaborations Agreement

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Maximum amount eligible for development and regulatory milestones under collaborations agreement.

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