Annual report pursuant to Section 13 and 15(d)

Stock Warrants (Additional Information) (Detail)

Stock Warrants (Additional Information) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]    
Weighted average term of warrants 2 years 3 months 18 days  
Weighted average exercise price of warrants per share $ 2.43  
Class Of Warrant Or Right Grants In Period 60,000 0
Stock Issued During Period, Shares, Warrant Exercised 3,559,783  
Proceeds from Issuance of Warrants $ 1,272,627  
Class Of Warrant Exercised In Cashless Basis 4,178,267  
Class Of Warrant Exercised In Cash Basis 568,488