Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
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 7,120,060 17,346,696
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 1,967,375 13,647,848
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 5,152,685 3,698,848