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Net Loss Per Common Share - Weighted-average Number of Those Common Stock Equivalents Outstanding (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities	20,763,600	9,412,845
Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities	79,149,568	44,585,932

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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