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Summary of Significant Accounting Policies - Software Development Costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Software Development Costs    
Software development costs capitalized $ 0 $ 0
Capitalized Technology | Minimum    
Software Development Costs    
Estimated useful lives of assets   2 years
Capitalized Technology | Maximum    
Software Development Costs    
Estimated useful lives of assets   5 years