Collaboration Agreements (Adicet Bio) (Details) - Subsequent Event [Member] $ in Millions	1 Months Ended
Jul. 30, 2016 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Period over which the Company has obligation	5 years
Adicet Bio [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Upfront Payment Made	$ 25.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration