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Revenue by Geographic Area - Percentage of Revenue by Geographic Area (Details) - Revenue from Contract with Customer Benchmark - Geographic Concentration Risk
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
United States    
Risks and Uncertainties [Abstract]    
Percentage of revenue (as a percent) 72.00% 71.00%
International    
Risks and Uncertainties [Abstract]    
Percentage of revenue (as a percent) 28.00% 29.00%