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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Dec. 31, 2013
2012 Plan [Member]
Jan. 31, 2012
Minimum [Member]
Dec. 31, 2013
Restricted stock units [Member]
Dec. 31, 2012
Restricted stock units [Member]
Dec. 31, 2012
Outstanding Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
2012 Plan [Member]
Dec. 31, 2013
2010 Stock Option Plan [Member]
Dec. 31, 2013
Stock options [Member]
Dec. 31, 2012
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unrecognized compensation expense $ 9,381,314         $ 4,605,913   $ 2,815,737         $ 4,775,401  
Weighted average period for unrecognized compensation expense expected to be recognized 2 years 10 months 24 days         3 years 6 months   3 years 4 months 24 days         2 years 6 months  
Common stock reserved for issuance under stock holders incentive plan         2,000,000                  
Purchase of common stock       1,208,750                    
Options outstanding 2,754,030 3,780,471 2,824,964           1,179,513 692,504 614,513 1,545,280    
Number of common stock reserved for future grants       375,507                    
Recognized compensation expense 829,071 656,534                     564,322 480,376
Total intrinsic value of options exercised 336,340 84,510                        
Weighted-average remaining contractual term, outstanding shares 7 years 18 days 6 years 6 months 7 years 3 months 15 days                      
Weighted-average exercise price, outstanding shares $ 4.16 $ 3.23 $ 4.09           $ 5.03 $ 4.85        
Aggregate intrinsic value, outstanding shares 7,313,083 4,862,479                        
Recognized stock-based compensation expense related to the outstanding RSUs           $ 264,749 $ 176,158