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Goodwill and Intangible Assets - Intangible Assets Changes in Carrying Amount (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Finite-lived Intangible Assets [Roll Forward]    
Beginning balance $ 2,254  
Amortization expense (556)  
Intangible assets acquired in asset acquisition 32 $ 40
Foreign currency translation adjustment 30  
Ending balance $ 1,760