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Collaboration and License Agreement Narrative (Details) - BeiGene - USD ($)
3 Months Ended
Jan. 07, 2018
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Upfront fee received $ 10,000,000  
Milestone payments receivable $ 123,000,000.0  
Revenue from contract with customer   $ 9,500,000
Remaining performance obligation   $ 500,000