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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2013
USD ($)
ft²
Sep. 30, 2006
USD ($)
ft²
$ / ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2012
USD ($)
Commitments And Contingencies [Line Items]                  
Restricted time deposits     $ 4,145 $ 5,181   $ 4,145 $ 5,181    
FibroGen, Inc. [Member]                  
Commitments And Contingencies [Line Items]                  
Land subject to leases | ft²   234,249              
Initial term of lease contract   15 years              
Restricted time deposits   $ 7,300              
Percentage of letter of credit released         0.125%        
Description of lessee leasing arrangements, operating leases           The agreement included an expansion option to occupy part of an adjacent building within 31 months of the lease commencement date of November 20, 2008.      
Lease incentive receivable from land lord through expansion option not used                 $ 5,000
Percentage of construction costs for tenant improvement   60.00%              
Tenant improvement price per square foot of rental space | $ / ft²   140.50              
Tenant improvements allowance of rental space   $ 32,500              
Cost of construction capitalized   50,800              
Reimbursements from landlord for tenant improvements   $ 32,500              
FibroGen, Inc. [Member] | Reclassified from Restricted Cash to Short-term Investments [Member]                  
Commitments And Contingencies [Line Items]                  
Prior period reclassification adjustment     $ 1,000 $ 1,000 $ 1,000        
FibroGen China [Member]                  
Commitments And Contingencies [Line Items]                  
Land subject to leases | ft² 4,820                
Initial term of lease contract 8 years                
Percentage of construction costs for tenant improvement 100.00%                
Cost of construction capitalized $ 3,100                
Reimbursements from landlord for tenant improvements $ 500                
Lease starting date Feb. 01, 2013                
Rent expenses for leased facilities           $ 3,100 3,000 $ 2,800  
FibroGen China [Member] | Research and Development Expenses and General and Administrative Expenses [Member]                  
Commitments And Contingencies [Line Items]                  
Sublease income received           $ 3,500 $ 3,900 $ 3,800