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Revenue - Capitalized Costs and Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue          
Amortization period 7 years   7 years    
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true/false]     true    
Capitalized costs to obtain contracts, current $ 553   $ 553   $ 413
Capitalized costs to obtain contracts, non-current 2,648   2,648   $ 2,150
Amortization of capitalized costs to obtain contracts $ 110 $ 85 $ 329 $ 205