Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)

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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)
9 Months Ended
Sep. 30, 2018
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 1 year
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 15 years