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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jan. 31, 2012
2012 plan [Member]
Dec. 31, 2012
2012 plan [Member]
May 31, 2003
2012 plan [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2012
Outstanding Restricted Stock [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
2012 plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unrecognized compensation expense $ 9,024,393           $ 2,815,737     $ 6,208,656      
Weighted average period for unrecognized compensation expense expected to be recognized 3 years 1 month 6 days               3 years 4 months 24 days 2 years 10 months 24 days      
Restricted stock unit outstanding under 2012 plan 3,780,471   3,512,286               719,167 515,834 244,167
Common stock reserved for issuance under stock holders incentive plan       2,000,000                  
Purchase of common stock         1,080,063 400,000              
Number of common stock reserved for future grants         902,482                
Recognized stock-based compensation expense related to the outstanding restricted stock units             176,158 76,861          
Stockholders' Equity (Textual) [Abstract]                          
Per share weighted average fair value of options granted $ 2.48                        
Total intrinsic value of options exercised 84,510 3,524,675                      
Weighted-average remaining contractual term, outstanding shares 6 years 6 months 11 days   6 years 5 months 16 days                    
Weighted-average exercise price, outstanding shares $ 3.23   $ 3.39               $ 5.15 $ 6.30  
Aggregate intrinsic value, outstanding shares 4,862,479                        
Options exercisable 2,126,294                        
Weighted-average remaining contractual term, exercisable shares 4 years 6 months 26 days                        
Weighted-average exercise price, exercisable shares $ 1.55                        
Aggregate intrinsic value, exercisable shares $ 4,304,201                        
Common stock outstanding 25,995,216   25,995,216