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Note 6 - Long-term Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 05, 2020
May 25, 2017
May 31, 2017
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 24, 2021
Mar. 22, 2021
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.01              
Debt Instrument, Prepayment Premium, Percent 7.00%              
Derivative Liability, Current $ 2,000       $ 1,847 $ 0    
Reclassification of Warrant Liability to Additional Paid-in Capital 900              
Debt Issuance Costs, Net, Total 1,100              
Fair Value Adjustment of Warrants $ 139       (139) 0    
Gain (Loss) on Extinguishment of Debt, Total         $ (12,394) $ 0    
Conversion of Series 1 Preferred Stock in to Common Stock [Member]                
Conversion of Stock, Shares Converted (in shares)         2,469      
Conversion of Stock, Shares Issued (in shares)         1,000,068      
Preferred Class A [Member]                
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 405.05              
2020 Convertible Senior Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage 7.00%              
Debt Instrument, Face Amount $ 27,400              
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]                
Debt Conversion, Original Debt, Amount $ 27,300              
Debt Conversion, Converted Instrument, Shares Issued (in shares) 10,000              
Gain (Loss) on Extinguishment of Debt, Total       $ (12,400)        
Conversion of Convertible Senior Notes 2020 into Common Stock [Member]                
Debt Conversion, Original Debt, Amount $ 17,500       $ 38,900      
Debt Conversion, Converted Instrument, Shares Issued (in shares) 2,600,000              
2017 Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 362,500              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 6.75              
2017 Warrants [Member] | Subsequent Event [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             362,500 362,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 0.01  
Senior Secured Debt [Member]                
Debt Instrument, Fee Amount   $ 60,000            
Debt Instrument, Additional Amount after Refinance   $ 15,000 $ 15,000          
Debt Instrument, Payment-in-kind Rate   6.00%            
Debt Instrument, Cash Rate   2.00%            
Debt Instrument, Interest Rate, Stated Percentage   7.00%            
Debt Instrument, Face Amount     60,000          
Prior Senior Secured Debt [Member]                
Extinguishment of Debt, Amount   $ 45,000 $ 45,000