Significant Accounting Policies - Additiona Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Restricted cash	$ 20,000	$ 20,000
Minimum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful lives	three
Maximum
Significant Accounting Policies [Line Items]
Property plant and equipment estimated useful lives	five