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Long-term Obligations (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 09, 2011
May 31, 2009
Mar. 31, 2009
Sep. 09, 2011
Amended and Restated Loan and Security Agreement [Member]
Sep. 09, 2011
Term Loan [Member]
Sep. 09, 2011
Term Loan [Member]
Initial Payments [Member]
Sep. 09, 2011
Term Loan [Member]
Interim Payments [Member]
Sep. 09, 2011
Term Loan [Member]
Final Payment [Member]
Debt Instrument [Line Items]                      
Number of payments                 12 29 1
Payment amount $ 825,000               $ 20,833 $ 825,000 $ 825,000
Maturity date               Mar. 01, 2015      
Date from which warrants are exercisable               Sep. 09, 2011      
Warrants issued to lenders (in shares)               132,891      
Warrant exercise price (in dollars per share) $ 25.00       $ 2.62 $ 2.59   $ 3.01      
Warrant expiration date               Sep. 09, 2018      
Term Loan remaining balance at date of Amendment 22,275,000             15,600,000      
Prorated final payment fee             419,000        
Net proceeds of the Term Loan, after payment of lender fees and expenses 0 9,444,000 20,000,000         8,600,000      
Percentage of cash flows of modified instrument of original debt instrument (in hundredths) 10.00%                    
Fees amount associated with loan               300,000     1,250,000
Unamortized debt discount 917,000           332,000 267,000      
Effective interest rate (in hundredths)       13.63%              
Additional details relating term loan that is outstanding [Abstract]                      
Origination Date Sep. 30, 2011                    
Original Loan Amount 25,000,000                    
Interest Rate (in hundredths) 9.87%                    
Current Monthly Payment 1,008,212 [1]                    
Term 42 years                    
Remaining Principal (Face Value) 22,275,000             15,600,000      
Future contractual principal and final fee payments on all debt and lease obligations [Abstract]                      
2013 9,927,000                    
2014 9,922,000                    
2015 3,749,000                    
2016 6,000                    
Contractual principal and final fee payments, Total 23,604,000                    
Reconciliation of Face Value to Book Value [Abstract]                      
Contractual principal and final fee payments, Total 23,604,000                    
Less: Debt discount (917,000)           (332,000) (267,000)      
Total: 22,687,000                    
Less: Current portion (9,784,000) (2,487,000)                  
Long-term obligation 12,903,000 21,962,000                  
Interest expense 3,386,000 2,784,000 2,052,000                
Non-cash amortization $ 930,000 $ 711,000 $ 703,000                
[1] Current monthly payment is inclusive of interest and principal