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Income Taxes - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]        
Deferred tax expense   $ 1,562,000 $ 0  
Operating loss carryforwards $ 6,070,000 6,070,000    
Deferred tax assets, valuation allowance 2,561,000 2,561,000 1,397,000 $ 155,000
Interest and penalties accrued 0 0 $ 0  
Tax Act, income tax expense 0      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 5,810,000 5,810,000    
Federal, State and Foreign Jurisdictions        
Operating Loss Carryforwards [Line Items]        
Unrecognized tax benefits $ 0 $ 0