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Geographic Sales Information - Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues    
Revenue $ 29,069 $ 25,042
United States    
Revenues    
Revenue 17,983 13,463
All other countries    
Revenues    
Revenue $ 11,086 $ 11,579