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Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	117,908,963	110,712,843
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	19,491,667	16,295,000
Convertible Debentures
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	27,231,569	41,021,402
Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,085,000	3,585,000
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	71,185,727	53,396,441

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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