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Collaboration Agreements - AstraZeneca Agreements - Additional Information 1 (Detail) - AstraZeneca Agreements [Member] - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 30, 2013 | Mar. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2015
U.S./RoW [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Upfront, non-contingent, non-refundable and time-based payments | $ 374.0 |  |  |  |
Potential milestone payments | 875.0 |  |  |  |
Commercial sales milestone | 325.0 |  |  |  |
Shared development costs |  |  |  | $ 233.0 |
Additional consideration based on net sales description |  | Low 20% range |  |  |
U.S./RoW [Member] | FibroGen, Inc. [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Shared development costs |  |  |  | $ 116.5 |
U.S./RoW [Member] | Clinical and Development Milestone [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | 65.0 |  |  |  |
U.S./RoW [Member] | Regulatory Milestone [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | 325.0 |  |  |  |
U.S./RoW [Member] | Deferred Approval Milestone [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | 160.0 |  |  |  |
U.S./RoW [Member] | Development Milestones [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Receipt of development milestone payment |  |  |  |  | $ 15.0
China [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | 348.5 |  |  |  |
Proceeds from upfront, non-contingent and non-refundable payments | 28.2 |  |  |  |
Commercial sales and other events milestone | 187.5 |  |  |  |
Milestone payment, revenue recognition |  |  | $ 15.0 |  |
China [Member] | Clinical and Development Milestone [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | 15.0 |  |  |  |
China [Member] | Regulatory Milestone [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payments | $ 146.0 |  |  |  |

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