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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 15, 2018
Jan. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Lessee Lease Description [Line Items]            
Operating lease, initial ROU lease assets     $ 13,754     $ 13,700
Operating lease, initial lease liabilities     14,168     $ 14,500
Operating lease, weighted-average remaining lease term           6 years
Operating lease, expense     3,100 $ 3,200 $ 3,100  
Operating lease, payments     $ 3,400      
San Diego, California            
Lessee Lease Description [Line Items]            
Area of real estate property | ft²     52,148      
Lease expiration date     Dec. 31, 2025      
Lessee, operating lease, renewal term     5 years      
Rent expense for additional office space for first twelve months     $ 900      
Rent expense for additional office space for last twelve month     $ 1,300      
San Diego, California | Subsequent Event            
Lessee Lease Description [Line Items]            
Area of real estate property | ft²   21,180        
Lease expiration date   Dec. 31, 2025        
Operating lease, initial ROU lease assets   $ 5,100        
Operating lease, initial lease liabilities   5,700        
Unamortized lease incentive   $ 600        
Redwood City, California            
Lessee Lease Description [Line Items]            
Area of real estate property | ft²     26,067      
Lease expiration date     May 31, 2019      
Sublease expiration date May 31, 2019          
Jersey City, New Jersey            
Lessee Lease Description [Line Items]            
Area of real estate property | ft²     1,898      
Lease expiration date     Dec. 31, 2019      
Accounting Standards Update 2016-02            
Lessee Lease Description [Line Items]            
Operating lease, expense     $ 3,000