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Summary of Significant Accounting Policies - Basic and Diluted Net Loss per Share Computations (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Net loss from continuing operations	$ (8,461,714)	$ (11,970,735)	$ (17,812,415)	$ (19,533,263)
Net loss from discontinued operations		(144,489)		(202,217)
Net loss	$ (8,461,714)	$ (12,115,224)	$ (17,812,415)	$ (19,735,480)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share	95,190,823	55,711,717	82,277,137	55,529,818
Basic and diluted net loss per share from continuing operations	$ (0.09)	$ (0.22)	$ (0.22)	$ (0.36)
Basic and diluted net loss per share from discontinued operations	0	0	0	0
Basic and diluted net loss per share	$ (0.09)	$ (0.22)	$ (0.22)	$ (0.36)

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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- Definition

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

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