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Debt - Borrowings (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Jun. 01, 2009
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Debt Instrument [Line Items]              
Long-term debt         $ 70,000    
Gains on cancellation of debt       $ 0 0 $ 892,000  
Conversion of subordinated convertible debt       0 6,145,000 $ 1,500,000  
Debt conversion, converted instrument, number of shares issued     3,323,913        
One-time charge in relation to the conversion of the notes       2,700,000      
Interest expense       154,000      
Write off of deferred debt issuance cost       293,000      
Revolving credit facility              
Debt Instrument [Line Items]              
Credit facility, remaining borrowing capacity       2,300,000      
Unsecured convertible notes | Common stock              
Debt Instrument [Line Items]              
Conversion of subordinated convertible debt $ 6,150,000            
Debt conversion, converted instrument, number of shares issued 2,671,739            
Unsecured promissory note - Quercus Trust              
Debt Instrument [Line Items]              
Unsecured promissory note - Quercus Trust   $ 70,000     $ 70,000    
Credit facility, commitment fee percentage   1.00%          
Single payment to cancel note and accrued interest       13,000      
Accrued interest       5,000      
Unsecured promissory note - Quercus Trust | Other income              
Debt Instrument [Line Items]              
Gains on cancellation of debt       $ 62,000      
Convertible debt              
Debt Instrument [Line Items]              
Debt conversion, converted instrument, additional interest rate             5.00%