Collaborative Arrangements and Acquisitions - Moderna Therapeutics, Inc. (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Jun. 30, 2018
Moderna Therapeutics, Inc.
Schedule of Collaborative Arrangement Agreements [Line Items]
Carrying value of investments		$ 23.0
Moderna Therapeutics, Inc.
Schedule of Collaborative Arrangement Agreements [Line Items]
Collaborative arrangement, up-front payment	$ 20.0
Collaborative arrangement, investment in collaborative partner, pursuant to convertible loan agreement	20.0
Collaborative arrangement, development and regulatory potential milestone payments maximum	275.0
Collaborative arrangement approval and reimbursement milestones	$ 220.0

Collaborative Arrangement Approval and Reimbursement Milestones

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- Definition

Represents the potential milestone amount to be paid by the entity under the collaboration agreement if drug candidates are approved and commercialized.

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- Definition

Collaborative Arrangement, Investment in Collaborative Partner, Amount

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- Definition

The amount of the up-front license fee paid by the entity pursuant to a collaborative arrangement.

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- Definition

Equity Securities without Readily Determinable Fair Value, Amount

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- Definition

-- None. No documentation exists for this element. --

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