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Description of Business - Textual (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Proceeds from issuance of common stock in connection with private placement         $ 50,000 $ 0
Private Placement [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Shares issued (in shares) 3,048,780          
Price per share (in dollars per share) $ 16.40       $ 16.40  
Issuance costs $ 74       $ 74 $ 0
Proceeds from issuance of common stock in connection with private placement $ 49,900          
Nestec Ltd. (Nestle Health Sciences) [Member] | CDX-6114 [Member] | Collaborative Arrangement [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Milestone payment amount     $ 1,000      
Duration to pay after milestone achievement     60 days   60 days  
Event of counterparty exercising alternative option   $ 3,000   $ 3,000