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Leases - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
ft²
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2019
USD ($)
Lessee Lease Description [Line Items]        
Right-of-use lease assets $ 13,754 $ 17,594 $ 17,594  
Operating lease, initial lease liabilities   18,842 18,842  
Operating lease, expense   1,000 2,000  
Operating lease, payments   $ 1,000 $ 1,700  
Accounting Standards Update 2016-02        
Lessee Lease Description [Line Items]        
Right-of-use lease assets       $ 13,700
Operating lease, initial lease liabilities       $ 14,500
San Diego, California        
Lessee Lease Description [Line Items]        
Area of real estate property | ft² 21,180      
Lease commencement date Jan. 01, 2020      
Lease expiration date Dec. 31, 2025      
Lessee, operating lease, renewal term 5 years      
Lessee, operating lease, existence of option to extend true      
Operating leases, remaining lease term   66 months 66 months