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Long-term Obligations (Details) - USD ($)
 12 Months Ended
Dec. 29, 2017
May 29, 2015
Dec. 31, 2017
Dec. 31, 2016
Sep. 20, 2017
Jun. 15, 2016
May 11, 2016
May 10, 2016
Debt Instrument [Line Items]                
Number of shares callable by warrants (in shares)           1 1,100,000 16,000,000
Warrant exercise price (in dollars per share)           $ 3.06    
Minimum liquidity covenant     $ 1,500,000          
Future contractual principal and final fee payments on all debt and capital lease obligations [Abstract]                
2018     5,192,000          
2019     8,877,000          
Total     14,069,000          
Reconciliation of Face Value to Book Value [Abstract]                
Total debt and lease obligations, including final payment fee (Face Value)     14,069,000          
Less: Debt discount     (445,000)          
Total obligation     13,624,000          
Interest expense     2,049,000 $ 2,592,000        
Non-cash amortization     $ 700,000 $ 1,000,000        
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 May 29, 2015        
Original Loan Amount   $ 17,700,000 $ 17,700,000 $ 17,700,000        
Basis variable rate   7.95%            
Maturity date     Jun. 01, 2019          
Fees amount associated with loan   $ 1,100,000            
Number of shares callable by warrants (in shares)   94,441            
Warrant exercise price (in dollars per share)   $ 10.35            
Date from which warrants are exercisable     Nov. 30, 2015          
Warrant expiration date     May 29, 2025          
Minimum liquidity covenant   $ 5,000,000     $ 1,500,000      
Extended interest-only period     Aug. 01, 2018          
Debt instrument, interest-only period     The amendment also extended the interest-only period under the Loan Agreement through August 1, 2018, as the Company successfully closed on a financing and received unrestricted net cash proceeds in excess of $5 million before December 29, 2017.          
Net proceeds excess receives from unrestricted cash $ 5,000,000              
Debt instrument, covenant compliance     we were in compliance with all of the debt covenants under the Loan and Security Agreement.          
Additional details relating term loan that is outstanding [Abstract]                
Origination Date     May 29, 2015 May 29, 2015        
Original Loan Amount   $ 17,700,000 $ 17,700,000 $ 17,700,000        
Interest Rate [1]     8.95% 8.95%        
Current Monthly Payment     $ 100,000 $ 136,000 [2],[3]        
Original Term     48 months 48 months        
Remaining Principal (Face Value)     $ 12,980,000 $ 17,700,000        
Minimum [Member] | Term Loan [Member]                
Debt Instrument [Line Items]                
Interest rate   8.95%            
Maximum [Member] | Term Loan [Member]                
Debt Instrument [Line Items]                
Original Loan Amount         3,000,000      
Additional details relating term loan that is outstanding [Abstract]                
Original Loan Amount         $ 3,000,000      
[1] 3 month LIBOR rate with a floor of 1% plus 7.95%
[2] Monthly payment as of December 2016, which reflects interest only
[3] Monthly payment as of December 2017, which reflects interest only