Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Narrative (Details)

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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term debt, net   $ 2,740,000  
Accretion expense   49,000 $ 82,000
Success fee $ 250,000    
Current share price (in dollars per share) $ 8    
Contingent success fee liability   6,000  
Debt covenant, unrestricted cash   3,564,000  
Cash   $ 10,872,000 $ 7,655,000
Interest rate   10.23%  
Loan Agreement      
Debt Instrument [Line Items]      
Borrowing capacity $ 7,000,000    
Variable rate 5.41%    
Debt term   36 months  
Long-term debt, net   $ 245,000  
Accretion expense   $ 228,000