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Stock Based Compensation (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Plans
Sep. 30, 2013
Sep. 30, 2014
Minimum [Member]
1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member]
Sep. 30, 2014
Minimum [Member]
2001 Non-Employee Director Stock Option Plan [Member]
Sep. 30, 2014
Minimum [Member]
2006 Equity Incentive Plan [Member]
Sep. 30, 2014
Maximum [Member]
1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member]
Sep. 30, 2014
Maximum [Member]
2001 Non-Employee Director Stock Option Plan [Member]
Sep. 30, 2014
Maximum [Member]
2006 Equity Incentive Plan [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
May 31, 2014
May 2014 Investor Warrant [Member]
May 31, 2014
May 2014 Agent Warrant [Member]
Stock-Based Compensation (Textual)                                
Options outstanding, vested and expected to vest, outstanding, number                     1,823,089   1,823,089      
Options outstanding, vested and expected to vest, aggregate intrinsic value                     $ 0   $ 0      
Share-based compensation expense 179,000 762,000 1,594,000 2,101,000             200,000 1,600,000 700,000 1,900,000    
Weighted average grant date fair value                     $ 3.35   $ 3.35      
Vesting period     1 year 10 months 24 days   1 year 1 year 1 year 4 years 4 years 4 years            
Stock option expiration period           5 years   10 years 7 years 10 years            
Options granted to purchase of common stock to employee                         355,000      
Options granted to purchase of common stock to board members                         10,000      
Options granted to purchase of common stock to board members, fair value                         1,200,000      
Number of equity incentive plan     2                          
Number of non employee director stock option plan     1                          
Warrants, Issued                         365,000   2,500,000  
Weighted Average Exercise Price, Issued                         $ 6.77   $ 5.09  
Gross proceeds                             12,725,000  
Placement agent fee     $ 600,000                       $ 600,000  
Shares of common stock                               75,000