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Summary of Significant Accounting Policies - Accounting Pronouncements - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Accounting Policies [Abstract]    
Lease, Practical Expedients, Package true  
Lease, Practical Expedient, Use of Hindsight true  
Assets and Liabilities, Lessee [Abstract]    
Operating lease right-of-use assets $ 8,668 $ 9,500
Operating Lease, Liability [Abstract]    
Operating lease, liability $ 9,549 $ 9,900