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Revenue - Capitalized Costs and Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue          
Amortization period 7 years   7 years    
Capitalized costs to obtain contracts, current $ 1,054   $ 1,054   $ 676
Capitalized costs to obtain contracts, non-current 4,871   4,871   $ 3,222
Amortization of capitalized costs to obtain contracts $ 251 $ 110 $ 620 $ 329