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Note 9 - Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 19, 2017
Jan. 31, 2018
Jul. 31, 2012
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Instrument, Convertible, Conversion Price       $ 14.72   $ 14.72   $ 0.74
Amortization of Debt Issuance Costs and Discounts, Total           $ 884,000 $ 196,000  
Interest Expense, Debt, Total       $ 904,000 $ 630,000 1,729,000 $ 1,341,000  
Convertible 2020 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage 12.00%       12.00%   12.00%  
Debt Instrument, Interest Rate, Paid In Kind Percentage 2.00%              
Debt Instrument, Convertible, Conversion Price $ 14.72              
Debt Instrument, Convertible, Conversion Ratio 0.06795              
Beneficial Ownership Limitation, Percentage 4.99%              
Beneficial Ownership Limitation Percentage, Notice 61 days              
Beneficial Ownership Limitation After Notice, Percentage 9.99%              
Stock Issued During Period, Shares, Conversion of Convertible Securities       260,793        
Stock Issued During Period, Value, Conversion of Convertible Securities       $ 3,200,000        
Debt Instrument, Make-Whole Interest       $ 700,000        
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period One [Member]                
Debt Instrument, Convertible, Conversion Price Reset Period 90 days              
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing 25.00%              
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member]                
Debt Instrument, Convertible, Conversion Price Premium Percentage on Common Stock Share Price in Equity Financing 35.00%              
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Minimum [Member]                
Debt Instrument, Convertible, Conversion Price Reset Period 90 days              
Convertible 2020 Notes [Member] | Debt Instrument Exchange Period Two [Member] | Maximum [Member]                
Debt Instrument, Convertible, Conversion Price Reset Period 180 days              
Convertible 2022 Notes [Member]                
Debt Instrument, Interest Rate, Stated Percentage     7.50%          
Debt Instrument, Face Amount     $ 45,000,000          
Proceeds from Convertible Debt     40,900,000          
Discount on Sale of Convertible Notes     2,700,000          
Debt Issuance Costs, Gross     $ 1,400,000          
Debt Instrument, Interest Rate, Effective Percentage     7.50%          
Amortization of Debt Issuance Costs and Discounts, Total           0 $ 80,000  
Expenses Related to Debt Conversion           20,000 1,200,000  
Interest Expense, Debt, Total           $ 0 $ 20,000  
Debt Discounts and Debt Issue Costs Amortization Rate           40.00%    
Debt Instrument, Convertible, Remaining Discount Amortization Period           5 years    
Debt Conversion, Original Debt, Amount   $ 500,000            
Debt Conversion, Converted Instrument, Shares Issued   39,016            
2020 Option Notes [Member]                
Debt Instrument, Convertible, Additional Convertible Amount $ 5,000,000              
Debt Instrument, Purchase Option Term 90 days              
Debt Instrument, Gain (Loss) on Exchange or Conversion $ (3,900,000)