v2.4.0.6

Exclusion of Potentially Dilutive Securities From Calculation of Diluted Net Loss Per Share (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Convertible notes	3,782,857	0
Series A non-voting preferred stock	287,324	0	0
Shares underlying outstanding warrants	8,610,665	4,807,534
Shares underlying outstanding stock options	3,298,297	1,547,122
Total	15,979,143	6,354,656

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Convertible Notes.

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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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Aggregate amount of each class of warrants or rights outstanding.

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