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Summary of Significant Accounting Policies (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Income Taxes          
Provision (benefit) for income taxes | $ $ 0 $ 0 $ 0 $ 0 $ 0
Segment Information          
Number of operating segment | segment       1