Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.3.0.814
Subsequent Events - Additional Information (Detail) - USD ($)
Oct. 23, 2015
Oct. 29, 2015
Warrant issued in October 2010 [Member]    
Subsequent Event [Line Items]    
Number of warrants expired unexercised 1,587,301  
Subsequent Event [Member] | Warrant issued in October 2010 [Member]    
Subsequent Event [Line Items]    
Number of warrants expired unexercised 1,587,301  
Subsequent Event [Member] | Maximum [Member]    
Subsequent Event [Line Items]    
Value of securities for issuance under shelf registration   $ 100,000,000