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Notes Payable (Narrative) (Details)
1 Months Ended 9 Months Ended
Jun. 23, 2017
USD ($)
item
Feb. 28, 2013
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Future cash flows weighted average market yield     7.70% 9.60%
Fair value of the financing derivative     $ 0 $ 16,000
Facility Agreement [Member]        
Debt Instrument [Line Items]        
Proceeds from issuance of debt   $ 20,500,000    
Facility agreement period   7 years    
Proceeds from issuance of debt agreement, net of issuance costs   $ 20,000,000    
Facility fee   $ 500,000    
Percentage of net proceeds from out side financing or equity component   25.00%    
Cash and cash equivalent minimum amount quarterly required   $ 2,000,000    
Notes [Member]        
Debt Instrument [Line Items]        
Proceeds from issuance of debt   $ 20,500,000    
Debt instrument, stated interest rate   8.75%    
Percentage of net proceeds from out side financing or equity component 25.00% 25.00%    
Repayment of notes payable $ 4,500,000      
Number of Notes holders paid | item 1      
Aggregate principal amount     $ 16,000,000  
Maturity date     Feb. 29, 2020