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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