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Summary of Significant Accounting Policies - Basic and Dilutive Net Loss per Share Computations (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Net loss from continuing operations	$ (8,960,000)	$ (9,643,000)	$ (8,462,000)	$ (9,351,000)	$ (10,108,000)	$ (2,620,000)	$ (11,971,000)	$ (7,562,000)	$ (36,415,026)	$ (32,260,663)	$ (32,260,663)	$ (25,986,692)
Net loss from discontinued operations										(480,611)	(480,611)	(452,467)
Net loss									$ (36,415,026)	$ (32,741,274)	$ (32,741,274)	$ (26,439,159)
Weighted average shares outstanding used to compute basic and diluted net loss per share									95,807,377	61,612,957	61,612,957	43,422,001
Basic and diluted net loss per share from continuing operations					$ (0.15)	$ (0.04)	$ (0.21)	$ (0.14)	$ (0.38)	$ (0.52)	$ (0.52)	$ (0.60)
Basic and diluted net loss per share from discontinued operations					0.00	0.00	0.00	0.00		(0.01)	(0.01)	(0.01)
Basic and diluted net loss per share	$ (0.08)	$ (0.09)	$ (0.09)	$ (0.14)	$ (0.15)	$ (0.04)	$ (0.21)	$ (0.14)	$ (0.38)	$ (0.53)	$ (0.53)	$ (0.61)

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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