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Notes Payable (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jun. 23, 2017
USD ($)
item
Jun. 30, 2017
USD ($)
item
Feb. 28, 2013
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Percentage of net proceeds from out side financing or equity component     25.00%      
Repayment of notes payable         $ 4,500,000  
Future cash flows weighted average market yield       9.60% 10.30%  
Fair value of the financing derivative       $ 16,000 $ 183,000 $ 356,000
Notes payable       14,659,000 13,635,000  
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      
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      
Principal amount of notes     $ 20,500,000      
Debt instrument, stated interest rate     8.75%      
Percentage of net proceeds from out side financing or equity component 25.00%          
Repayment of notes payable $ 4,500,000 $ 4,500,000     4,500,000  
Number of Notes holders paid | item 1 1        
Aggregate principal amount       16,000,000 16,000,000  
Fair value of the notes     $ 14,100,000      
Fair value of the warrants     6,400,000      
Carrying value of the notes     12,800,000      
Original issue discount     $ 7,700,000      
Debt discount that has yet to be amortized       1,300,000 2,400,000  
Notes payable       $ 14,700,000 $ 13,600,000  
Maturity date       Dec. 31, 2020