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Revenue - Capitalized Costs and Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue      
Amortization period 7 years    
Capitalized costs to obtain contracts, current $ 1,222 $ 676 $ 413
Capitalized costs to obtain contracts, non-current 5,464 3,222 $ 2,150
Amortization of capitalized costs to obtain contracts $ 904 $ 495