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Stock-Based Compensation (Details Textual) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Feb. 26, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Plan
Jun. 30, 2012
May 06, 2013
Stock Options [Member]
Mar. 19, 2013
Stock Options [Member]
Jun. 30, 2013
Stock Options [Member]
Apr. 04, 2013
Warrant [Member]
Dec. 03, 2010
Warrant [Member]
Jun. 30, 2012
Warrant [Member]
Jun. 30, 2013
Warrant [Member]
Jun. 30, 2012
Warrant [Member]
Jun. 30, 2013
Warrant [Member]
Minimum [Member]
Jun. 30, 2013
Warrant [Member]
Maximum [Member]
Jun. 30, 2013
1998 Non-Officer Stock Option Plan [Member]
Jun. 30, 2013
1998 Non-Officer Stock Option Plan [Member]
Minimum [Member]
Jun. 30, 2013
1998 Non-Officer Stock Option Plan [Member]
Maximum [Member]
Jun. 30, 2013
2006 Equity Incentive Plan [Member]
Jun. 30, 2013
2006 Equity Incentive Plan [Member]
Minimum [Member]
Jun. 30, 2013
2006 Equity Incentive Plan [Member]
Maximum [Member]
Jun. 30, 2013
2001 Non-Employee Director Stock Option Plan [Member]
Jun. 30, 2013
2001 Non-Employee Director Stock Option Plan [Member]
Minimum [Member]
Jun. 30, 2013
2001 Non-Employee Director Stock Option Plan [Member]
Maximum [Member]
Sep. 12, 2011
Three Year Stock Purchase Warrants [Member]
Jun. 30, 2013
Three Year Stock Purchase Warrants [Member]
Jun. 30, 2012
Three Year Stock Purchase Warrants [Member]
Jun. 30, 2013
Three Year Stock Purchase Warrants [Member]
Jun. 30, 2012
Three Year Stock Purchase Warrants [Member]
Stock-Based Compensation (Textual)                                                          
Stock option expiration date                               June 2008           March 2011              
Options outstanding, vested and expected to vest, outstanding, number               1,673,488                                          
Options outstanding, vested and expected to vest, aggregate intrinsic value               $ 2,600,000                                          
Additional common stock authorized for issuance as incentive stock options           2,000,000                                              
Common stock issued upon exercise of warrants, value             166,000                                            
Common stock issued upon exercise of warrants, Shares             38,456 (38,456)       (1,046,211)                                  
Intrinsic value related to options exercised             58,000                                            
Stock option vesting period                                 1 year 4 years   1 year 4 years   1 year 4 years          
Stock option expiration period                               10 years     10 years       5 years 7 years          
Warrant issued in period                   120,000                             20,000        
Exercise price of warrants per share                 $ 1.00 $ 1.63                             $ 3.90        
Fair value of warrants                   198,000   166,000                         75,000        
Amortized period of warrants                   24 months                             24 months        
Compensation expense related to the vesting of stock options   577,000 2,300,000 1,200,000 2,300,000           25,000   50,000                                
Fair value of warrants granted included in product research and development expenses                                                   10,000 9,000 19,000 18,000
Common stock shares received on warrants exercises                       148,145                                  
Additional cash exercise price per share                           $ 1.00 $ 3.13                            
Proceeds from exercise of warrants       200,000 8,000       40,000     200,000                                  
Warrants exercised to purchase common stock                 40,000                                        
Number of equity incentive plans       2                                                  
Number of non-employee director stock option plan       1                                                  
Options granted to purchase of common stock to employee       15,000                                                  
Stock options, grant date fair value       $ 80,000                                                  
Recognition period of unamortized expense related to stock options and warrants       2 years 8 months 12 days                                                  
Common stock purchase due to exercise of warrant by warrant holders excluding CFO       578,066                                                  
Common stock received due to net exercise provision of warrant 266,228     412,254                                                  
Common stock purchase due to exercise of warrant by CFO 320,000