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Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details)
9 Months Ended
Sep. 30, 2017
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life of finite lived intangible assets (in years) 5 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life of finite lived intangible assets (in years) 10 years