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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]    
Operating lease right-of-use asset $ 1,981  
Operating lease liability $ 2,133  
Accounting Standards Update 2016-02    
Summary Of Significant Accounting Policies [Line Items]    
Operating lease right-of-use asset   $ 2,200
Operating lease liability   $ 2,300