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Collaboration and Licensing Agreements (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jul. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) product item | Sep. 30, 2015 USD ($) item | Jan. 31, 2013 USD ($) item | Feb. 28, 2009 item | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2013 USD ($)
Option and license agreement | Alexion Pharmaceuticals, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrefundable upfront payment |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | $ 9,000,000 |  | $ 0 | $ 9,000,000 | $ 0 |  |  |
Number of different target programs | item |  |  |  | 6 |  |  |  |  |  |  |  |  |
Research license term |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Annual maintenance fees |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |
Milestone payment received |  |  |  |  |  |  |  |  | 17,500,000 |  |  |  |
Deferred revenue |  |  |  |  |  | 0 |  |  | 0 |  |  |  |
2009 Research License and Commercialization Agreement | CSL Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | 0 |  | 0 | 0 | 3,500,000 |  |  | $ 3,500,000
Deferred revenue |  |  |  |  |  | 0 |  |  | 0 |  |  |  |
Number of commercial licenses | item |  |  |  |  | 1 |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrefundable upfront payment | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | 20,040,000 |  | 0 | 20,040,000 | 0 |  |  |
Deferred revenue |  |  |  |  |  | 40,100,000 |  |  | 40,100,000 |  |  |  |
Milestones or royalties in transaction price |  |  |  |  |  |  |  |  | 0 |  |  |  |
Collaboration And License Agreement | Novartis | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Potential milestone payment |  |  |  |  |  | 2,400,000,000 |  |  | $ 2,400,000,000 |  |  |  |
Collaboration And License Agreement | Novartis | Bispecific FC Technologies |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Number of development stage products | product |  | 2 |  |  |  |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis | Bispecific FC Technologies | XmAb14045 |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to deliverables |  | $ 27,100,000 |  |  |  |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis | Bispecific FC Technologies | XmAb13676 |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to deliverables |  | 31,400,000 |  |  |  |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis | Global Discovery Program |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Number of bispecific drug candidates | item |  |  |  |  |  |  |  |  | 4 |  |  |  |
Allocation of consideration to deliverables |  | $ 20,050,000 |  |  |  |  |  |  |  |  |  |  |
Number of discovery programs | item |  | 4 |  |  |  |  |  |  |  |  |  |  |
Right to substitute identified target period |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Collaboration And License Agreement | Novartis | Global Discovery Program | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | 20,040,000 |  |  |  |  | $ 20,050,000 |  |
Collaboration And License Agreement | Novartis | Global Discovery Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Number of antibody targets for which bispecific technology applied | item |  | 4 |  |  |  |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis | FC Licenses |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to deliverables |  | $ 11,300,000 |  |  |  |  |  |  |  |  |  |  |
Collaboration And License Agreement | Novartis | FC Licenses | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Number of targets against which non-exclusive license is provided | item |  | 10 |  |  |  |  |  |  |  |  |  |  |
Research and License Agreement 2015 | Amgen, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Nonrefundable upfront payment |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |
Potential milestone payment |  |  | $ 1,700,000,000 |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | 0 | $ 10,000,000 | $ 0 | $ 0 | $ 0 |  |  |
Number of different target programs | item |  |  | 6 |  |  |  |  |  |  |  |  |  |
Allocation of consideration to deliverables |  |  |  |  |  | 55,000,000 |  |  | 55,000,000 |  |  |  |
Deferred revenue |  |  |  |  |  | 0 |  |  | 0 |  |  |  |
Milestones or royalties in transaction price |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Research and License Agreement 2015 | Amgen, Inc. | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  |  |  |  | $ 31,250,000 |
Research and License Agreement 2015 | Amgen, Inc. | CD38 Program |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to deliverables |  |  |  |  |  | 23,750,000 |  |  | $ 23,750,000 |  |  |  |
Research and License Agreement 2015 | Amgen, Inc. | Discovery Program |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration research and licensing agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Research license term |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Allocation of consideration to deliverables |  |  |  |  |  | $ 6,250,000 |  |  | $ 6,250,000 |  |  |  |
Number of discovery programs | item |  |  |  |  |  |  |  |  | 5 |  |  |  |
Additional research term |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Previous targets which bispecific technology will be applied | item |  |  | 5 |  |  |  |  |  |  |  |  |  |

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