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Revenue - Capitalized Costs and Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue          
Amortization period 7 years   7 years    
Capitalized costs to obtain contracts, current $ 960   $ 960   $ 676
Capitalized costs to obtain contracts, non-current 4,296   4,296   $ 3,222
Amortization of capitalized costs to obtain contracts $ 264 $ 113 $ 433 $ 222