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Intangible Assets - Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Intangible Assets        
Amortization of intangible assets $ 406 $ 336 $ 774 $ 700