Annual report pursuant to Section 13 and 15(d)

Contingencies and commitments - Universal Cells Research, Collaboration and License Agreement and Co-development and Co-commercialization agreement (Details)

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Contingencies and commitments - Universal Cells Research, Collaboration and License Agreement and Co-development and Co-commercialization agreement (Details) - Collaboration and license agreement - Universal Cells, Inc. - USD ($)
1 Months Ended 12 Months Ended
Nov. 25, 2015
Feb. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2023
Dec. 31, 2022
Contingencies and commitments            
Upfront license and start-up fees $ 2,500,000          
Milestone payments   $ 3,000,000 $ 200,000 $ 900,000    
First milestone payment           $ 500,000
Second milestone payment           600,000
Third milestone payment           $ 400,000
Milestone payment accrued but not yet paid         $ 0