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Related Parties - 1347 Investors LLC (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Nov. 19, 2019
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Jul. 26, 2017
Sep. 21, 2015
Related Party Transaction [Line Items]            
Consideration received, cash   $ 0.6        
Consideration received (in shares)   594,750        
Consideration received, warrants (in shares)   400,000        
Warrant exercise price (in dollars per share)   $ 15        
Limited Liability Company            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage   26.70% 26.70% 26.70%    
Equity Method Investee            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage   47.60% 47.60% 47.60% 0.00% 33.30%
Board of Directors Chairman            
Related Party Transaction [Line Items]            
Equity method investment, ownership percentage   40.60% 40.60% 40.60%    
Subsequent Event            
Related Party Transaction [Line Items]            
Consideration received, cash $ 0.6          
Consideration received (in shares) 594,750          
Consideration received, warrants (in shares) 400,000          
Warrant exercise price (in dollars per share) $ 15          
Kingsway Financial Services, Inc | Fundamental Global Investors, LLC            
Related Party Transaction [Line Items]            
Ownership percentage (less than at March 31, 2019)     5.00% 5.00%