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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Feb. 20, 2025 | Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Accounts receivable from related parties | $ 136 |  | $ 136 |  |  | $ 481
Falikang [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of outstanding shares owned |  |  | 51.10% |  |  |
Investment income (loss) | 1,700 | $ 1,200 | $ 1,100 | $ 1,800 |  |
Equity method investments | 8,100 |  | 8,100 |  |  | 6,900
Accounts receivable from related parties | 19,100 |  | 19,100 |  |  | $ 13,900
Falikang [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Revenues | 16,400 | $ 46,000 | $ 53,300 | $ 73,100 |  |
Decrease in revenue | $ 12,100 |  |  |  |  |
FibroGen International [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Description of discontinued operations |  |  | On February 20, 2025, the Company entered into the Share Purchase Agreement with AstraZeneca Treasury Limited, pursuant to which FibroGen and its subsidiary FibroGen China Anemia Holdings, Ltd. agreed to sell all of the issued and outstanding equity interests of FibroGen International to AstraZeneca Treasury Limited for an aggregate purchase price comprised of $85 million in cash for the enterprise value of FibroGen International, plus an additional cash amount equal to the net cash held in China by FibroGen International and its subsidiaries as of the closing. This sale includes all of our roxadustat assets in China, including FibroGen International’s subsidiary FibroGen Beijing and its 51.1% interest in Falikang. The transaction is expected to close in the third quarter of 2025, and is subject to customary closing conditions and closing deliverables, including receipt of regulatory approval from the China SAMR. The Company analyzed the quantitative and qualitative factors and concluded that the sale of FibroGen International represents a strategic shift in FibroGen’s business and qualified as a discontinued operation. As a result, Company determined that FibroGen International met the “held for sale” criteria and the “discontinued operations” criteria in accordance with FASB ASC 205, Presentation of Financial Statements, as of June 30, 2025 and December 31, 2024. Accordingly, the operating results related to the FibroGen International are classified as discontinued operations, and have been reflected as discontinued operations in the condensed consolidated statements of operations, while the related assets and liabilities were classified within the condensed consolidated balance sheets as held for sale for all periods presented. |  |  |
Discontinued operations name |  |  | FibroGen International |  |  |
Purchase price in cash |  |  |  |  | $ 85,000 |

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