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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
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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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