Collaborative Arrangements and Acquisitions - Moderna Therapeutics, Inc. (Details) - Moderna Therapeutics, Inc. $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
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