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Segment, Geographical and Other Revenue Information - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2019
USD ($)
Dec. 31, 2018
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
segment
Segment Reporting Information [Line Items]        
Number of operating segments | segment       2
CDX-6114 [Member] | Nestec Ltd. (Nestle Health Sciences) [Member] | Collaborative Arrangement [Member]        
Segment Reporting Information [Line Items]        
Milestone payment amount       $ 1.0
Duration to pay after milestone achievement   60 days   60 days
Event of counterparty exercising alternative option $ 3.0   $ 3.0