Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Other Financings - General Electric Capital Corporation (GECC) Term Loan - Additional Information (Details)

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Long-Term Debt and Other Financings - General Electric Capital Corporation (GECC) Term Loan - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Feb. 27, 2015
Sep. 27, 2012
Dec. 31, 2011
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]          
Carrying value of the loan       $ 48,585  
Repayment of principal, fees and accrued interest       6,128 $ 4,875
Loss on extinguishment of debt       (429)  
GECC Term Loan [Member]          
Debt Instrument [Line Items]          
Outstanding principal balance     $ 10,000    
Aggregate number of unregistered shares of common stock called by warrants (in shares)   39,346 263,158    
Exercise price of warrants (in dollars per share)   $ 3.54 $ 1.14    
Exercisable period of warrants   5 years 5 years    
Warrants expiration period   2017-09 2016-12    
Fair value of warrant liability   $ 100 $ 200    
Repayment of principal, fees and accrued interest $ 5,500        
Loss on extinguishment of debt       (400)  
Hercules Loan [Member]          
Debt Instrument [Line Items]          
Outstanding principal balance       $ 20,000  
Aggregate number of unregistered shares of common stock called by warrants (in shares) 181,268        
Exercise price of warrants (in dollars per share) $ 3.31        
Exercisable period of warrants 5 years        
Warrants expiration period 2020-02        
Fair value of warrant liability $ 500        
Carrying value of the loan $ 20,000