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Stock Based Compensation - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining stock options outstanding to acquire common stock, assumed under the 2013 plan 4,483,207   3,272,837
Stock options granted   0  
Expected dividend rate 0.00%    
Intrinsic value of options exercised $ 29,814    
Stock-based compensation 1,641,000 346,000  
Expenses related to options issued to non-employees 0 24,000  
Total unrecognized compensation related to unvested $ 3,700,000    
Recognized over a weighted-average period 2 years 9 months 18 days    
2013 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares authorized for future issuance 4,408,369   3,342,839
Common shares available for grant 289,741    
Remaining stock options outstanding to acquire common stock, assumed under the 2013 plan 1,406,910    
2004 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares available for grant 0    
Stock option to acquire common stock 34,342    
Evergreen Provision [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares available for grant 1,065,530    
Percentage of Common Stock outstanding 5.00%    
Experience Group One [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture rate 0.00%    
Experience Group Two [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture rate 1.00%