Quarterly report pursuant to Section 13 or 15(d)

Debt - Outstanding Long-Term Debt (Details)

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Debt - Outstanding Long-Term Debt (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Aug. 11, 2014
Jun. 30, 2014
Debt Instrument [Line Items]        
Total debt, outstanding principal $ 20,990,000 $ 24,500,000    
Less: current portion, outstanding principal (20,990,000) (20,000,000)    
Long-term debt, outstanding principal 0 4,500,000    
Total debt, unamortized discount (1,017,000) (2,369,000)    
Less: current portion, unamortized discount 1,017,000 930,000    
Long-term debt, unamortized discount 0 (1,439,000)    
Total debt, net carrying amount 19,973,000 22,131,000    
Less: current portion, net carrying amount (19,973,000) (19,070,000)    
Long-term debt 0 3,061,000    
Hercules Term Loan        
Debt Instrument [Line Items]        
Total debt, outstanding principal 18,841,000 20,000,000   $ 20,000,000
Total debt, unamortized discount (1,017,000) (930,000)    
Total debt, net carrying amount 17,824,000 19,070,000    
Magna Convertible Notes        
Debt Instrument [Line Items]        
Total debt, outstanding principal   4,500,000    
Total debt, unamortized discount   (1,439,000)    
Total debt, net carrying amount 0 $ 3,061,000    
Magna August Note        
Debt Instrument [Line Items]        
Total debt, outstanding principal 2,149,000   $ 3,500,000  
Total debt, net carrying amount $ 2,149,000