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Discontinued Operations - Schedule of Carrying Value of Assets and Liabilities of Discontinued Operations (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 51,696 | $ 32,135
Total current assets held for sale | 110,849 | 65,776
Total long-term assets held for sale | 16,611 | 18,050
Liabilities |  |
Total current liabilities held for sale | 38,917 | 43,516
Total long-term liabilities held for sale | 356 | 1,504
FibroGen International [Member] |  |
Assets |  |
Cash and cash equivalents | 51,696 | 32,135
Accounts receivable, net | 18,443 | 7,432
Inventories | 15,547 | 24,392
Prepaid expenses and other current assets | 25,163 | 1,817
Total current assets held for sale | 110,849 | 65,776
Property and equipment, net | 7,041 | 8,341
Equity method investment in unconsolidated variable interest entity | 6,864 | 5,290
Operating lease right-of-use assets | 1,716 | 3,154
Other assets | 990 | 1,265
Total long-term assets held for sale | 16,611 | 18,050
Liabilities |  |
Accounts payable | 26,974 | 2,182
Accrued and other current liabilities | 10,679 | 39,904
Operating lease liabilities, current | 1,264 | 1,430
Total current liabilities held for sale | 38,917 | 43,516
Operating lease liabilities, non-current | 356 | 1,504
Total long-term liabilities held for sale | $ 356 | $ 1,504

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