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 ($)
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Debt Instrument [Line Items]      
Total debt, outstanding principal $ 24,298,000 $ 24,500,000  
Less: current portion, outstanding principal (20,798,000) (20,000,000)  
Long-term debt, outstanding principal 3,500,000 4,500,000  
Total debt, unamortized discount (1,753,000) (2,369,000)  
Less: current portion, unamortized discount 1,032,000 930,000  
Long-term debt, unamortized discount (721,000) (1,439,000)  
Total debt, net carrying amount 22,545,000 22,131,000  
Less: current portion, net carrying amount (19,766,000) (19,070,000)  
Long-term debt 2,779,000 3,061,000  
Hercules Term Loan      
Debt Instrument [Line Items]      
Total debt, outstanding principal 20,000,000 20,000,000 $ 20,000,000
Total debt, unamortized discount (752,000) (930,000)  
Total debt, net carrying amount 19,248,000 19,070,000  
Convertible Note      
Debt Instrument [Line Items]      
Total debt, outstanding principal 4,298,000 4,500,000  
Total debt, unamortized discount (1,001,000) (1,439,000)  
Total debt, net carrying amount $ 3,297,000 $ 3,061,000