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Notes Payable (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jun. 23, 2017
USD ($)
item
Feb. 29, 2020
USD ($)
Jun. 30, 2017
USD ($)
item
Feb. 28, 2013
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
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  
Notes payable, current         $ 15,871,000    
Future cash flows weighted average market yield         6.50%   9.60%
Fair value of the financing derivative         $ 0 $ 183,000 $ 16,000
Notes payable, non-current           14,659,000
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      
Notes payable, current         16,000,000    
Cash and cash equivalent minimum amount quarterly required       2,000,000      
Notes [Member]              
Debt Instrument [Line Items]              
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        
Number of Notes holders paid | item 1   1        
Aggregate principal amount         16,000,000   16,000,000
Debt discount that has yet to be amortized         $ 200,000   1,300,000
Maturity date         Dec. 31, 2020    
Notes payable, non-current         $ 15,800,000   $ 14,700,000
Forecast [Member]              
Debt Instrument [Line Items]              
Repayment of notes payable   $ 16,000,000