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Collaboration Agreements - Takeda Collaboration (Details) - Collaborative Arrangement with Takeda - USD ($) $ in Millions	Apr. 29, 2019	Apr. 28, 2019	Sep. 27, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Limit on reimbursement per year	$ 1.0
Increase in maximum amount eligible for development and regulatory milestones	12.0
Maximum amount eligible for development and regulatory milestones	102.0
Milestone payments earned	16.0	$ 10.0
Increase in maximum amount eligible for commercial milestones under collaborations agreement	6.0
Maximum amount eligible for commercial milestones under collaborations agreement	$ 89.0
Remaining performance obligation			$ 18.7
Net contract liability			$ 8.2

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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