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Summary of Significant Accounting Policies - Recently issued pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2019
Recently Issued Pronouncement    
Practical expedient - package true  
Right-of-use assets   $ 3,132
Operating leases liabilities   $ 3,422
ASU 2016-02    
Recently Issued Pronouncement    
Right-of-use assets $ 3,600  
Operating leases liabilities 4,000  
Derecognized deferred rent liability $ 390