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Revenue - Capitalized Costs and Amortization (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Revenue  
Amortization period 7 years
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true/false] true
Capitalized costs to obtain contracts, current $ 413
Capitalized costs to obtain contracts, non-current 2,150
Amortization of capitalized costs to obtain contracts $ 283