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Net Loss per Common Share - Exercise of Stock Options and Warrants and Vesting of Restricted (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options, warrants and restricted stock	2,027,640	2,196,327
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options, warrants and restricted stock	1,320,156	1,426,077
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options, warrants and restricted stock	550,000	550,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options, warrants and restricted stock	157,484	220,250

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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