Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Note Payable (Details Textual)

v3.20.2
Note 6 - Note Payable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Nov. 26, 2019
Nov. 12, 2019
Dec. 29, 2017
May 22, 2017
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         23,583,290   23,583,290    
Notes Payable, Noncurrent, Total         $ 4,241,000   $ 4,241,000   $ 3,983,000 [1]
Gains (Losses) on Restructuring of Debt $ (6,705,000)                
Series B Preferred Stock [Member]                  
Conversion of Stock, Conversion Rate (in dollars per share)         $ 1.53   $ 1.53    
Preferred Stock, Fair Value, Per Share (in dollars per share) $ 1,023.23                
Convertible Preferred Stock, Fair Value $ 32,027,000                
Minimum [Member] | Series B Convertible Preferred Stock Into Common Stock [Member]                  
Conversion of Stock, Conversion Rate (in dollars per share)   $ 1.53              
Maximum [Member] | Series B Convertible Preferred Stock Into Common Stock [Member]                  
Conversion of Stock, Conversion Rate (in dollars per share)   $ 1.836              
Conversion of Term Loan with CRG Into Stock and Warrants [Member]                  
Debt Conversion, Original Debt, Amount   $ 28,981,000              
Debt Conversion, Converted Instrument, Amount   $ 31,300,000              
Conversion of Term Loan with CRG Into Series B Convertible Preferred Stock [Member]                  
Debt Conversion, Converted Instrument, Shares Issued (in shares) 31,300 31,300              
May 2017 Issuance Related to 2017 Loan Agreement [Member]                  
Warrants and Rights Outstanding, Term (Year)       10 years          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       2,220          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 950          
Warrants and Rights Outstanding       $ 940,000          
Warrants Issued Upon Conversion of Term Loan with CRG [Member]                  
Warrants and Rights Outstanding, Term (Year)   5 years              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 9,893,776 9,893,776              
Class of Warrants and Rights Outstanding, Exercise Price Percentage of Conversion Rate   120.00%              
Warrants and Rights Outstanding   $ 3,502,000     $ 3,502,000   $ 3,502,000    
The 2017 Loan Agreement [Member]                  
Notes Payable, Noncurrent, Total         4,241,000   4,241,000    
The 2017 Loan Agreement [Member] | CRG LP [Member]                  
Debt Instrument, Face Amount       20,000,000          
Debt Agreement, Covenant, Additional Funding       10,000,000          
Debt Agreement, Maximum Borrowing Capacity       $ 30,000,000          
Proceeds from Lines of Credit, Total     $ 10,000,000            
Debt Instrument, Term (Year)       6 years          
Debt instrument, Interest Only Payment, Period (Year)       4 years          
Debt Instrument, Interest Rate, Stated Percentage       12.50%          
Debt Instrument, Interest Rate, Stated Percentage Deferred During Interest-only Period       4.00%          
Paid-in-Kind Interest         130,000 $ 324,000 256,000 $ 624,000  
Debt Instrument, Prepayment Fee, Percentage       5.00%          
Debt Instrument, Back-end Facility Fee Percentage of Principal   25.00%   5.00%          
Notes Payable, Noncurrent, Total         $ 4,241,000   $ 4,241,000   $ 3,983,000
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.