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Leases - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Lessee Lease Description [Line Items]      
Right-of-use lease assets $ 12,246 $ 12,246  
Operating lease, initial lease liabilities $ 12,504 $ 12,504  
Operating lease, weighted-average remaining lease term 75 months 75 months  
Operating lease, expense $ 600 $ 2,300  
Operating lease, payments $ 800 $ 2,900  
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]      
Operating leases, remaining lease term   75 months  
Jersey City, New Jersey      
Lessee Lease Description [Line Items]      
Operating leases, remaining lease term   3 months