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Warrant Liability (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2012
Warrants [Member]
Dec. 31, 2011
Warrants [Member]
Class of Warrant or Right [Line Items]        
Warrant liability, fair value $ 1,008,000 $ 1,008,000    
Changes in fair value of warrants $ 251,000 $ 381,000    
Expected term     1 year 1 month 13 days 1 year 7 months 10 days
Common stock market price (in dollars per share)     $ 2.70 $ 2.20
Risk-free interest rate (in hundredths)     0.21% 0.19%
Expected volatility (in hundredths)     77.29% 69.98%
Resulting fair value (per warrant) (in dollars per share)     $ 0.50 $ 0.32