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Significant Accounting Policies - ASU 2016-02 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
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 $ 8,024 $ 8,668 $ 9,500
Operating Lease, Liability [Abstract]      
Operating lease, liability $ 8,878   $ 9,900