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Long-term Obligations (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Principal [Member]
Dec. 31, 2013
Accrued interest [Member]
Dec. 31, 2013
Amended and Restated Loan and Security Agreement [Member]
Dec. 31, 2013
Term Loan [Member]
Dec. 31, 2012
Term Loan [Member]
Jun. 28, 2013
Term Loan [Member]
Dec. 31, 2013
Term Loan [Member]
Final Payment [Member]
Debt Instrument [Line Items]                    
Maturity date             Jul. 01, 2017      
Date from which warrants are exercisable             Jun. 28, 2013      
Warrants issued to lenders (in shares)                 596,553  
Warrant exercise price (in dollars per share) $ 25.00               $ 2.26  
Warrant expiration date             Jun. 28, 2020      
Net proceeds of the Term Loan, after payment of lender fees and expenses $ 27,000,000 $ 0 $ 9,444,000       $ 7,800,000      
Fees amount associated with loan                 312,000 1,620,000
Unamortized debt discount 2,379,000         949,000     1,942,000  
Effective interest rate (in hundredths)           13.92%        
Extinguishment of Debt Disclosures [Abstract]                    
Payments to extinguish debt 18,866,000     17,325,000 119,000          
Loss on extinguishment of debt 708,000 0 0              
Additional details relating term loan that is outstanding [Abstract]                    
Origination Date               Sep. 30, 2011    
Original Loan Amount             27,000,000      
Interest Rate (in hundredths)             9.75%      
Current Monthly Payment 868,000           219,375 [1]      
Term             48 months      
Remaining Principal (Face Value)             27,000,000      
Future contractual principal and final fee payments on all debt and lease obligations [Abstract]                    
2014   3,318,000                
2015   8,502,000                
2016   9,346,000                
2017   7,504,000                
Contractual principal and final fee payments, Total 28,670,000 28,670,000                
Reconciliation of Face Value to Book Value [Abstract]                    
Contractual principal and final fee payments, Total 28,670,000 28,670,000                
Less: Debt discount (2,379,000)         (949,000)     (1,942,000)  
Total: 26,291,000                  
Less: Current portion (3,191,000) (9,784,000)                
Long-term obligation 23,100,000 12,903,000                
Interest expense 3,396,000 3,386,000 2,784,000              
Non-cash amortization $ 893,000 $ 930,000 $ 711,000              
[1] Current monthly payment is inclusive of interest only