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Significant Accounting Policies - Recently Issued Accounting Standards (Details) - USD ($)
Jan. 01, 2019
Sep. 30, 2019
New accounting pronouncement, modified retrospective method    
Operating Lease, Right-of-Use Asset $ 3,600,000 $ 3,166,539
Operating Lease, Liability $ 4,300,000 $ 3,721,252
ASU 2016-02    
New accounting pronouncement, modified retrospective method    
Accounting principle adopted true  
Transition option upon adoption Modified Retrospective  
Prior periods not restated true  
Operating Lease, Right-of-Use Asset $ 3,600,000  
Operating Lease, Liability $ 4,300,000  
ASU 2018-07    
New accounting pronouncement, modified retrospective method    
Accounting principle adopted true