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Long-term Debt (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 28, 2013
May 31, 2009
Mar. 31, 2009
Jun. 28, 2013
Term Loan [Member]
Sep. 09, 2011
Term Loan [Member]
Jun. 28, 2013
Term Loan [Member]
Final Payment [Member]
Debt Instrument [Line Items]                    
Origination date               Jun. 28, 2013    
Original loan amount                 $ 27,000,000  
Interest rate (in hundredths)                 9.75%  
Maturity date               Jul. 01, 2017    
Fees amount associated with loan                 322,000 1,942,000
Date from which warrants are exercisable               Jun. 28, 2013    
Warrants issued to lenders (in shares)                 596,553  
Warrant exercise price (in dollars per share)           $ 2.62 $ 2.59   $ 2.26  
Warrant expiration date               Jun. 28, 2020    
Repayment of long term debt     22,292,000 140,000       18,866,000    
Term Loan remaining balance at date of Amendment                 17,325,000  
Accrued but unpaid interest               119,000    
Final payment fee               1,078,000    
Prepayment fee               312,000    
Net proceeds of the Term Loan, after payment of lender fees and expenses     27,000,000 0       7,800,000    
Percentage of cash flows of modified instrument of original debt instrument (in hundredths) 10.00%   10.00%              
Unamortized debt discount                 949,000  
Effective interest rate (in hundredths)         13.92%          
Loss on debt extinguishment $ 708,000 $ 0 $ 708,000 $ 0       $ 708,000