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Commitment 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, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2012
USD ($)
Commitments And Contingencies [Line Items]                
Restricted time deposits     $ 5,181 $ 6,217 $ 5,181 $ 6,217    
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] | South San Francisco [Member]                
Commitments And Contingencies [Line Items]                
Land subject to sublease | ft²   106,000            
Lease and sublease termination date   Feb. 28, 2015            
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        
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         $ 3,000 2,800 $ 2,700  
FibroGen China [Member] | Research and Development Expenses and General and Administrative Expenses [Member]                
Commitments And Contingencies [Line Items]                
Sublease income received         $ 3,900 $ 3,800 $ 3,400