Quarterly report pursuant to Section 13 or 15(d)

Debt - Future Principal Payments on Debt (Details)

v3.2.0.727
Debt - Future Principal Payments on Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Line Of Credit Facility [Line Items]    
Total debt, net carrying amount $ 22,545 $ 22,131
Hercules Term Loan    
Line Of Credit Facility [Line Items]    
Total debt, net carrying amount 19,248 19,070
Magna Convertible Notes    
Line Of Credit Facility [Line Items]    
Total debt, net carrying amount 3,297 $ 3,061
Convertible Notes Payable    
Line Of Credit Facility [Line Items]    
2015 2,949  
2016 11,964  
2017 8,567  
2018 818  
Total debt, net carrying amount 24,298  
Convertible Notes Payable | Hercules Term Loan    
Line Of Credit Facility [Line Items]    
2015 2,949  
2016 7,666  
2017 8,567  
2018 818  
Total debt, net carrying amount 20,000  
Convertible Notes Payable | Magna Convertible Notes    
Line Of Credit Facility [Line Items]    
2015 0  
2016 4,298  
2017 0  
2018 0  
Total debt, net carrying amount $ 4,298