Related Party Transactions 1347 Investors LLC (Details)	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2015
Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage		40.60%	32.30%
Limited Liability Company [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage		26.70%
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	47.60%			51.00%	33.30%