Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Note Payable (Details Textual)

v3.20.1
Note 6 - Note Payable (Details Textual)
3 Months Ended
Nov. 26, 2019
USD ($)
$ / shares
shares
Nov. 12, 2019
USD ($)
$ / shares
shares
Dec. 29, 2017
USD ($)
May 22, 2017
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         23,665,905    
Notes Payable, Noncurrent, Total         $ 4,110,000   $ 3,983,000 [1]
Share Price (in dollars per share) | $ / shares $ 0.869            
Gains (Losses) on Restructuring of Debt $ (6,705,000)            
Series B Preferred Stock [Member]              
Conversion of Stock, Conversion Rate (in dollars per share) | $ / shares         $ 1.53    
Preferred Stock, Fair Value, Per Share (in dollars per share) | $ / shares $ 1,023.23            
Convertible Preferred Stock, Fair Value $ 32,027,000            
Series B Preferred Stock [Member] | Measurement Input, Option Volatility [Member]              
Convertible Preferred Stock, Measurement Input 73            
Series B Preferred Stock [Member] | Measurement Input, Expected Term [Member]              
Convertible Preferred Stock, Measurement Input 2            
Series B Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member]              
Convertible Preferred Stock, Measurement Input 1.58            
Minimum [Member] | Series B Convertible Preferred Stock Into Common Stock [Member]              
Conversion of Stock, Conversion Rate (in dollars per share) | $ / shares   $ 1.53          
Maximum [Member] | Series B Convertible Preferred Stock Into Common Stock [Member]              
Conversion of Stock, Conversion Rate (in dollars per share) | $ / shares   $ 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) | 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) | shares       2,220 2,220    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 950 $ 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) | shares 9,893,776 9,893,776     9,893,776    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 1.84    
Class of Warrants and Rights Outstanding, Exercise Price Percentage of Conversion Rate   120.00%          
Warrants and Rights Outstanding $ 3,502,000 $ 3,502,000          
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         $ 126,000 $ 318,000  
Debt Instrument, Prepayment Fee, Percentage       5.00%      
Debt Instrument, Covenant, Cash and Cash Equivalents       $ 2,000,000      
Debt Instrument, Back-end Facility Fee Percentage of Principal   25.00%   5.00%      
Notes Payable, Noncurrent, Total         $ 4,110,000   $ 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.