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Long-term Debt (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 28, 2013
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         1,620,000 1,942,000
Date from which warrants are exercisable         Jun. 28, 2013  
Warrant expiration date         Jun. 28, 2020  
Repayment of long term debt     0 22,292,000 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     0 27,000,000 7,800,000  
Unamortized debt discount         949,000  
Effective interest rate (in hundredths)         13.92%  
Loss on debt extinguishment $ 0 $ 708,000 $ 0 $ 708,000 $ 708,000