Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail)

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Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from the computation of dilutive weighted average shares outstanding 5,951,315 17,266,668
Warrant [Member]    
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from the computation of dilutive weighted average shares outstanding 1,969,250 13,709,977
Stock Options [Member]    
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from the computation of dilutive weighted average shares outstanding 3,982,065 3,556,691