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Leases - Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Rent expense $ 1,528 $ 1,269
Variable lease payments 299 355
Cash paid for amounts included in the measurement of lease liabilities $ 1,057 $ 1,011
Weighted average remaining lease term (in years) 4 years 4 months 13 days  
Weighted average discount rate 5.09%