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Summary of Significant Accounting Policies - Basic and Dilutive Net loss Per Share Computations (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Net loss	$ (7,191,653)	$ (16,336,790)	$ (19,476,782)	$ (25,732,707)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share	41,402,717	30,168,475	39,787,527	25,992,764
Basic and diluted net loss per share	$ (0.17)	$ (0.54)	$ (0.49)	$ (0.99)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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