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Stock-Based Compensation (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Jun. 30, 2012
Jun. 30, 2012
Mar. 16, 2012
Sep. 12, 2011
Jun. 30, 2012
Stock Options [Member]
Jun. 30, 2011
Stock Options [Member]
Jun. 30, 2012
Stock Options [Member]
Jun. 30, 2011
Stock Options [Member]
Sep. 30, 2011
Warrant [Member]
Dec. 31, 2010
Warrant [Member]
Jun. 30, 2012
Warrant [Member]
Jun. 30, 2011
Warrant [Member]
Jun. 30, 2012
Warrant [Member]
Jun. 30, 2011
Warrant [Member]
Sep. 12, 2011
Warrant [Member]
Dec. 03, 2010
Warrant [Member]
Jun. 30, 2012
September 2011 Warrant [Member]
Jun. 30, 2012
September 2011 Warrant [Member]
Jun. 30, 2011
Five Year Stock Purchase Warrants [Member]
Jun. 30, 2011
Five Year Stock Purchase Warrants [Member]
Jun. 30, 2011
Three Year Stock Purchase Warrants [Member]
Jun. 30, 2012
2001 Non-Employee Director Stock Option Plan [Member]
Minimum [Member]
Jun. 30, 2012
2001 Non-Employee Director Stock Option Plan [Member]
Maximum [Member]
Jun. 30, 2012
1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member]
Minimum [Member]
Jun. 30, 2012
1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member]
Maximum [Member]
Stock Based Compensation (Textual)                                                      
Options outstanding, vested and expected to vest, aggregate intrinsic value             $ 2,800,000   $ 2,800,000                                    
Options outstanding, vested and expected to vest, outstanding, number             1,471,200   1,471,200                                    
Stock option vesting period                                               1 year 4 years 1 year 4 years
Stock option expiration period                                               5 years 7 years   10 years
Share-based compensation expense             2,300,000 35,000 2,300,000 70,000     25,000 25,000 50,000 50,000     9,000 18,000              
Warrant issued in period                     20,000 120,000                 80,000 80,000 20,000        
Fair value of warrants           75,000             230,000   230,000     198,000                  
Common stock issuable upon exercise of warrants     100,000 100,000 200,000                                            
Excercise price of warrants per share     $ 3.13 $ 3.13                         $ 3.90 $ 1.625     $ 2.50 $ 2.50 $ 2.00        
Number of approved stock option plans       3                                              
Number of equity incentive plans       2                                              
Number of non-employee director stock option plan       1                                              
Options granted to purchase of common stock to employee     1,100,000                                                
Options granted to purchase of common stock to members of Board     360,000                                                
Options life       7 years                                              
Number of options vesting on grant date       0.3333                                              
Vesting period of options following grant date       24 months                                              
Amortized period of warrants 24 months 24 months                                                  
Remaining vesting period of warrants       22 months                                              
Warrant exercised to purchase common stock one     21,000 21,000                                              
Warrant exercised to purchase common stock two     2,500 2,500                                              
Conversion of warrant into common stock, shares converted     13,831 13,831 174,798                                            
Warrant total excercise price     $ 7,813