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Discontinued Operations - Schedule of Carrying Value of Assets and Liabilities of Discontinued Operations (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Total current assets held for sale | $ 108,292 | $ 110,849
Total long-term assets held for sale | 15,563 | 16,611
Liabilities |  |
Total current liabilities held for sale | 8,275 | 38,917
Total long-term liabilities held for sale | 189 | 356
FibroGen International [Member] |  |
Assets |  |
Cash and cash equivalents | 72,591 | 51,696
Accounts receivable, net | 22,037 | 18,443
Inventories | 12,771 | 15,547
Prepaid expenses and other current assets | 893 | 25,163
Total current assets held for sale | 108,292 | 110,849
Property and equipment, net | 6,806 | 7,041
Equity method investment in unconsolidated variable interest entity | 6,351 | 6,864
Operating lease right-of-use assets | 1,419 | 1,716
Other assets | 987 | 990
Total long-term assets held for sale | 15,563 | 16,611
Liabilities |  |
Accounts payable | 93 | 26,974
Accrued and other current liabilities | 7,131 | 10,679
Operating lease liabilities, current | 1,051 | 1,264
Total current liabilities held for sale | 8,275 | 38,917
Operating lease liabilities, non-current | 189 | 356
Total long-term liabilities held for sale | $ 189 | $ 356

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