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Loss per Share - Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Loss per Share (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	3,180,925	3,033,021
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	1,425,129	1,874,230

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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