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Intangible Assets - Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Intangible Assets        
Amortization of intangible assets $ 543 $ 406 $ 1,054 $ 774