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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Oct. 16, 2013
Subsequent Event [Member]
Oct. 31, 2013
Subsequent Event [Member]
IPO [Member]
Oct. 16, 2013
Subsequent Event [Member]
IPO [Member]
Subsequent Event [Line Items]          
Initial public offering number of share sold       5,000,000  
Initial public offering price per share         $ 16
Additional shares sold under over-allotments Option to underwriter       750,000  
Proceeds from initial public offering net of expenses       $ 83.8  
Common stock, shares issued 2,124,624 1,098,914 25,020,288    
Common stock, shares outstanding 2,124,624 1,098,914 25,020,288    
Preferred stock, shares outstanding     0    
Milestone Payments Triggered 5.0        
Research Maintenance Payment Receivable $ 4.0