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Notes Payable (Narrative) (Details)
1 Months Ended
Jun. 23, 2017
USD ($)
item
Feb. 28, 2013
USD ($)
Feb. 28, 2013
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Future cash flows weighted average market yield       8.40% 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 $ 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 $ 2,000,000    
Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of debt     $ 20,500,000    
Debt instrument, stated interest rate   8.75% 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