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Summary of Significant Accounting Policies - Software Development Costs (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
Software Development Costs  
Software development costs capitalized $ 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