Significant Accounting Policies - Potential Dilutive Securities Excluded from the Computation of Dilutive Weighted Average Shares Outstanding (Detail) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 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	5,797,315	2,039,040
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	1,112,180
Preferred Stock [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		329,617
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	3,828,065	597,243