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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jul. 10, 2015
Jun. 30, 2015
Subsequent Event [Line Items]    
Aggregate gross proceeds   $ 52.8
Preferred Shares Basis    
Subsequent Event [Line Items]    
Share conversion price   $ 0.15
Ordinary Shares Basis    
Subsequent Event [Line Items]    
Share conversion price   $ 1.50
Subsequent Event    
Subsequent Event [Line Items]    
Aggregate gross proceeds $ 5.8  
Subsequent Event | Series A Preferred Stock    
Subsequent Event [Line Items]    
Shares issued 38,867,180  
Subsequent Event | Ordinary Shares    
Subsequent Event [Line Items]    
Shares issued 3,886,718  
Subsequent Event | Preferred Shares Basis    
Subsequent Event [Line Items]    
Share conversion price $ 0.15  
Subsequent Event | Ordinary Shares Basis    
Subsequent Event [Line Items]    
Share conversion price $ 1.50