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Stock- Based Compensation (Details Textual) (USD $)
9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
1994 Plan [Member]
Dec. 31, 2004
1994 Plan [Member]
Sep. 30, 2012
2003 Plan [Member]
Sep. 18, 2003
2003 Plan [Member]
Dec. 31, 2010
Amended 2003 Plan [Member]
Dec. 31, 2008
Amended 2003 Plan [Member]
Dec. 31, 2007
Amended 2003 Plan [Member]
Stock-Based Compensation (Textual) [Abstract]                  
Common stock reserved for future issuance       450,000   450,000 1,160,000 810,000 670,000
Shares of common stock vested and exercisable     12,000   689,167        
Percentage of option price     100.00%   100.00%        
Stock option period     10 years   10 years        
vesting period     3 years   3 years        
Weighted average fair value of options granted at market $ 0.39 $ 2.26              
Total intrinsic value $ 0 $ 0              
Intrinsic value of outstanding exercisable options $ 0 $ 0