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Long-term Obligations (Details) - USD ($)
 12 Months Ended
May. 29, 2015
Jun. 28, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 14, 2015
Sep. 30, 2014
Sep. 10, 2014
Jun. 04, 2014
May. 31, 2014
Debt Instrument [Line Items]                    
Warrant exercise price (in dollars per share)     $ 0.75 $ 0.69   $ 3.50 $ 2.00 $ 1.00 $ 3.00 $ 2.62
Repayment of long term debt     $ 25,032,000 $ 1,962,000 $ 22,304,000          
Net proceeds of the Term Loan, after payment of lender fees and expenses     17,700,000 0 27,000,000          
Unamortized debt discount     2,108,000              
Loss on debt extinguishment     260,000 0 708,000          
Future contractual principal and final fee payments on all debt and capital lease obligations [Abstract]                    
2016     0              
2017     7,080,000              
2018     7,080,000              
2019     4,629,000              
Contractual principal and final fee payments, Total     18,789,000              
Reconciliation of Face Value to Book Value [Abstract]                    
Contractual principal and final fee payments, Total     18,789,000              
Less: Debt discount     (2,108,000)              
Long-term obligation     16,681,000 18,041,000            
Interest expense     3,379,000 4,371,000 3,396,000          
Non-cash amortization     $ 979,000 1,220,000 $ 893,000          
LIBOR [Member] | Interest Rate Floor [Member]                    
Debt Instrument [Line Items]                    
Basis variable rate 1.00%                  
Term Loan [Member]                    
Debt Instrument [Line Items]                    
Maturity date   Jul. 01, 2017 Jun. 01, 2019              
Fees amount associated with loan $ 1.1 $ 1,795,000                
Date from which warrants are exercisable   Jun. 28, 2013 Nov. 30, 2015              
Warrants issued to lenders (in shares) 1,416,618 596,553                
Warrant exercise price (in dollars per share) $ 0.69 $ 2.26                
Warrant expiration date   Jun. 28, 2020 May 29, 2025              
Repayment of long term debt $ 25.4 $ 18,866,000                
Term Loan remaining balance at date of Amendment 23.4 17,325,000 $ 17,700,000 $ 25,038,125            
Accrued but unpaid interest 0.2 119,000                
Final payment fee 1.8 1,078,000                
Prepayment fee   312,000                
Net proceeds of the Term Loan, after payment of lender fees and expenses   7,800,000                
Unamortized debt discount 0.8 949,000                
Loss on debt extinguishment $ 0.3 $ 708,000                
Effective interest rate 14.95% 13.86%                
Outstanding warrants issued and re-priced (in shares)   596,553                
Interest rate 8.95%                  
Basis variable rate 7.95%                  
Principal amount of previous loan retired $ 3,100,000                  
Additional details relating term loan that is outstanding [Abstract]                    
Origination Date   Jun. 28, 2013 May 29, 2015 Jun. 30, 2014            
Original Loan Amount     $ 17,700,000 $ 27,000,000            
Interest Rate [1]     8.95% 9.75%            
Current Monthly Payment [2]     $ 136,413 $ 203,434            
Original Term     48 months 48 months            
Remaining Principal (Face Value) 23.4 $ 17,325,000 $ 17,700,000 $ 25,038,125            
Reconciliation of Face Value to Book Value [Abstract]                    
Less: Debt discount (0.8) (949,000)                
Term Loan [Member] | Final Payment [Member]                    
Debt Instrument [Line Items]                    
Fees amount associated with loan $ 0.8 $ 1,942,000                
[1] 3 month LIBOR rate with a floor of 1% plus 7.95%.
[2] Current monthly payment is inclusive of interest only