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Discontinued Operations - Schedule of Carrying Value of Assets and Liabilities of Discontinued Operations (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Assets    
Total current assets held for sale $ 132,650 $ 110,849
Total long-term assets held for sale 14,894 16,611
Liabilities    
Total current liabilities held for sale 8,458 38,917
Total long-term liabilities held for sale 156 356
FibroGen International [Member]    
Assets    
Cash and cash equivalents 96,474 51,696
Accounts receivable, net 22,143 18,443
Inventories 10,871 15,547
Prepaid expenses and other current assets 3,162 25,163
Total current assets held for sale 132,650 110,849
Property and equipment, net 4,670 7,041
Equity method investment in unconsolidated variable interest entity 8,115 6,864
Operating lease right-of-use assets 1,122 1,716
Other assets 987 990
Total long-term assets held for sale 14,894 16,611
Liabilities    
Accounts payable 123 26,974
Accrued and other current liabilities 7,486 10,679
Operating lease liabilities, current 849 1,264
Total current liabilities held for sale 8,458 38,917
Operating lease liabilities, non-current 156 356
Total long-term liabilities held for sale $ 156 $ 356