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Significant Agreements - Accounting Analysis (Details) $ in Millions		1 Months Ended	5 Months Ended	9 Months Ended
	Jan. 01, 2018 item	May 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of development and commercialization licenses | item	5
Juno Therapeutics
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total transaction price			$ 12.3	$ 45.8
Collaboration and License Agreement | Juno Therapeutics
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Transaction price upfront fee received				25.0
Transaction price research and development expenses funding				8.1
Milestone payments received				2.7
Amended Collaboration and License Agreement | Juno Therapeutics
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Transaction price upfront fee received				5.0
Milestone payments received				$ 5.0
License Agreement | Beam Therapeutics, Inc
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total transaction price		$ 3.8

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- Definition

Number of commercialization development licenses.

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