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Basis of Presentation and Summary of Significant Accounting Policies - Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Operating lease right-of use assets $ 13,531  
Operating lease liabilities 13,788  
Operating lease liabilities, current (2,259)  
Operating lease liabilities, long-term $ (11,529)  
Accounting Standards Update 2016-02    
Lessee, Lease, Description [Line Items]    
Operating lease right-of use assets   $ 3,502
Operating lease liabilities   3,700
Operating lease liabilities, current   (2,015)
Operating lease liabilities, long-term   (1,706)
Accounting Standards Update 2016-02 | New Lease Standard Adjustment    
Lessee, Lease, Description [Line Items]    
Operating lease right-of use assets   3,502
Operating lease liabilities, current   (2,015)
Operating lease liabilities, long-term   $ (1,706)