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Summary of Significant Accounting Policies - Intangible Assets and Impairment of Long-Lived Assets (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Estimated useful life of intangible assets 15 years  
Impairment losses on long-lived assets $ 0 $ 0