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Net Loss Per Common Share - Schedule of Stock Options and Warrants (Detail)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	3,449,295	2,459,506
Common stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	2,556,093	2,259,506
Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential common stock equivalents	893,202	200,000

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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