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Collaboration Agreements, License Agreement and Revenues - AstraZeneca Agreements - Additional Information 1 (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 30, 2013 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Deferred Revenue |  |  | $ 12,739 | $ 15,857 |  |
Aggregate considerations received |  |  | 77,200 |  |  |
Deferred revenue ($9,259 and $3,201 to related parties) |  |  | 12,739 | 15,857 |  |
Total revenue |  |  | 140,734 | 235,309 | $ 176,319 |
Product Revenue, Net [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total revenue |  |  | 82,869 | 47,638 | 72,498 |
Drug Product Revenue [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total revenue |  |  | 11,086 | 962 | 8,906 |
China [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Milestone payment received |  |  | 2,300 |  |  |
AstraZeneca Agreements [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Milestone payment received |  |  | 71,167 |  |  |
AstraZeneca Agreements [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Reversal of accrued co-promotion expenses |  | $ 84,400 |  |  |  |
Co-promotion expenses |  |  | $ 4,400 | 4,700 | 27,200 |
AstraZeneca Agreements [Member] | U.S./RoW [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Upfront, non-contingent, non-refundable and time-based payments | $ 374,000 |  |  |  |  |
Potential milestone payments | 875,000 |  |  |  |  |
Commercial sales milestone | 325,000 |  |  |  |  |
Shared development costs |  |  |  |  |  | $ 233,000
Additional consideration based on net sales description |  |  | low 20% range |  |  |
Aggregate considerations received excluding drug product revenue |  |  | $ 439,000 |  |  |
AstraZeneca Agreements [Member] | U.S./RoW [Member] | FibroGen, Inc. [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Shared development costs |  |  |  |  |  | $ 116,500
AstraZeneca Agreements [Member] | U.S./RoW [Member] | Clinical and Development Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | 65,000 |  |  |  |  |
AstraZeneca Agreements [Member] | U.S./RoW [Member] | Regulatory Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | 325,000 |  |  |  |  |
AstraZeneca Agreements [Member] | U.S./RoW [Member] | Deferred Approval Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | 160,000 |  |  |  |  |
AstraZeneca Agreements [Member] | China [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | 348,500 |  |  |  |  |
Proceeds from upfront, non-contingent and non-refundable payments | 28,200 |  |  |  |  |
Commercial sales and other events milestone | 187,500 |  |  |  |  |
Total revenue |  |  | 0 | 0 | (90) |
AstraZeneca Agreements [Member] | China [Member] | Accrued and Other Current Liabilities [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Deferred Revenue |  |  | 7,300 | 7,900 |  |
Deferred revenue ($9,259 and $3,201 to related parties) |  |  | 7,300 | 7,900 |  |
AstraZeneca Agreements [Member] | China [Member] | Clinical and Development Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | 15,000 |  |  |  |  |
AstraZeneca Agreements [Member] | China [Member] | Regulatory Milestone [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Potential milestone payments | $ 146,000 |  |  |  |  |
Direct Sales [Member] | Product Revenue, Net [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Total revenue |  |  | $ 11,702 | $ 12,070 | $ 72,498 |

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