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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. + References No definition available. + Details
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- Definition The amount of transaction price research and development expenses funding. + References No definition available. + Details
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