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Subsequent Event - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2015
Jul. 23, 2015
Feb. 26, 2015
Jul. 31, 2015
Jun. 30, 2015
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Subsequent Event [Line Items]                
Proceeds from issuance of common stock           $ 20,213,000    
Series B Convertible Preferred Stock                
Subsequent Event [Line Items]                
Convertible common stock shares     26,000          
Common shares issued upon conversion of convertible preferred stocks         100 100    
Preferred stock, shares outstanding         17,430 17,430   43,000
Cowen                
Subsequent Event [Line Items]                
Proceeds from issuance of common stock           $ 20,200,000    
Common shares issued in initial public offering           929,590    
Hercules Technology Growth Capital, Inc. (“Hercules”)                
Subsequent Event [Line Items]                
Proceeds from lines of credit         $ 0      
Debt instrument, maturity date           Jul. 01, 2018    
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche                
Subsequent Event [Line Items]                
Proceeds from lines of credit         $ 0      
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche | Scenario Forecast                
Subsequent Event [Line Items]                
Debt under Loan Agreement             $ 30,000,000  
Debt instrument, maturity date           Jan. 01, 2019    
Subsequent Event | Common Stock                
Subsequent Event [Line Items]                
Common shares issued upon conversion of convertible preferred stocks   1,743,000            
Subsequent Event | Common Stock | I P O                
Subsequent Event [Line Items]                
Common shares issued in initial public offering 5,227,273              
Public offering net price per share $ 27.50              
Net proceeds from offering $ 134,800,000              
Subsequent Event | Common Stock | Over-Allotment Option                
Subsequent Event [Line Items]                
Common shares issued in initial public offering 681,818              
Subsequent Event | Series B Convertible Preferred Stock                
Subsequent Event [Line Items]                
Convertible common stock shares   17,430            
Preferred stock, shares outstanding   0            
Subsequent Event | Cowen                
Subsequent Event [Line Items]                
Proceeds from issuance of common stock       $ 28,800,000        
Common stock sales agreement aggregate sales proceeds to date       $ 50,000,000