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Collaborative Arrangement, Number Of Initial Programs

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Revenue Recognition, Duration to Pay After Milestone Achievement

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Balance held at close of period in number of shares.

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Cash received from collaborators during the current period.

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Description of Business (Details) $ in Thousands	1 Months Ended			6 Months Ended
Description of Business (Details) $ in Thousands	Jun. 30, 2020 USD ($) program shares	Mar. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments to acquire other investments				$ 1,000	$ 0
Molecular Assemblies, Inc. [Member] \| Series A Preferred Stock [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of shares acquired in an equity method investment \| shares	1,587,050			1,587,050
Payments to acquire other investments	$ 1,000
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 (in days)			60 days
Takeda [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of initial programs \| program	3
Number of additional programs \| program	4
One-time, non-refundable cash payment		$ 8,500