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Long-term Debt (Details) - USD ($)
 3 Months Ended 9 Months Ended
May. 29, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 10, 2014
Jun. 04, 2014
Debt Instrument [Line Items]              
Warrant exercise price (in dollars per share)     $ 2.00   $ 2.00 $ 1.00 $ 3.00
Repayment of long term debt       $ 25,032,000 $ 1,303,000    
Loss on debt extinguishment   $ 0 $ 0 $ 260,000 $ 0    
LIBOR [Member] | Interest Rate Floor [Member]              
Debt Instrument [Line Items]              
Basis variable rate 1.00%            
Term Loan [Member]              
Debt Instrument [Line Items]              
Origination date       May 29, 2015      
Original loan amount $ 17,700,000            
Interest rate 8.95%            
Basis variable rate 7.95%            
Maturity date       Jun. 01, 2019      
Fees amount associated with loan $ 1,100,000            
Date from which warrants are exercisable       Nov. 30, 2015      
Warrants issued to lenders (in shares) 1,416,618            
Warrant exercise price (in dollars per share) $ 0.69            
Warrant expiration date       May 29, 2025      
Repayment of long term debt $ 25,400,000            
Term Loan remaining balance at date of Amendment 23,400,000            
Accrued but unpaid interest 200,000            
Final payment fee 1,800,000            
Principal amount of previous loan retired 3,100,000            
Unamortized debt discount $ 800,000            
Effective interest rate 14.95%            
Loss on debt extinguishment $ 300,000            
Term Loan [Member] | Final Payment [Member]              
Debt Instrument [Line Items]              
Fees amount associated with loan $ 800,000