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Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2015
Feb. 28, 2015
Jun. 30, 2015
Organization And Description Of Business [Line Items]      
Entity incorporation state     Delaware
Entity incorporation date     Aug. 01, 2012
Net proceeds from sale of common stock     $ 69,487
Follow-on Offering      
Organization And Description Of Business [Line Items]      
Common stock, shares issued   4,147,358  
Shares issued, price per share   $ 18.00  
Net proceeds from sale of common stock   $ 69,500  
Follow-on Offering | Subsequent Event      
Organization And Description Of Business [Line Items]      
Common stock, shares issued 3,980,768    
Shares issued, price per share $ 52.00    
Net proceeds from sale of common stock $ 193,900