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Long-term Debt (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2013
Sep. 09, 2011
May 31, 2009
Mar. 31, 2009
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]
Sep. 09, 2011
Amended and Restated Loan and Security Agreement [Member]
Debt Instrument [Line Items]                  
Origination date         Sep. 09, 2011        
Original loan amount         $ 25,000,000        
Interest rate (in hundredths)         9.87%        
Number of payments           12 29 1  
Payment amount 825,000         20,833 825,000 825,000  
Maturity date         Mar. 01, 2015        
Fees amount associated with loan (in hundredths)               5.00%  
Fees amount associated with loan         300,000     1,250,000  
Date from which warrants are exercisable         Sep. 09, 2011        
Warrants issued to lenders (in shares)         132,891        
Warrant exercise price (in dollars per share)     $ 2.62 $ 2.59 $ 3.01        
Warrant expiration date         Sep. 09, 2018        
Term Loan remaining balance at date of Amendment         15,600,000        
Prorated final payment fee                 419,000
Net proceeds of the Term Loan, after payment of lender fees and expenses         8,600,000        
Percentage of cash flows of modified instrument of original debt instrument (in hundredths) 10.00%                
Unamortized debt discount         $ 267,000       $ 332,000
Effective interest rate (in hundredths)   13.63%