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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Net loss from continuing operations	$ (10,108,000)us-gaap_IncomeLossFromContinuingOperations	$ (2,620,000)us-gaap_IncomeLossFromContinuingOperations	$ (11,971,000)us-gaap_IncomeLossFromContinuingOperations	$ (7,562,000)us-gaap_IncomeLossFromContinuingOperations	$ (6,848,000)us-gaap_IncomeLossFromContinuingOperations	$ (7,126,000)us-gaap_IncomeLossFromContinuingOperations	$ (5,745,000)us-gaap_IncomeLossFromContinuingOperations	$ (6,268,000)us-gaap_IncomeLossFromContinuingOperations	$ (32,260,663)us-gaap_IncomeLossFromContinuingOperations	$ (25,986,692)us-gaap_IncomeLossFromContinuingOperations	$ (27,971,259)us-gaap_IncomeLossFromContinuingOperations
Net loss from discontinued operations									(480,611)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net loss									$ (32,741,274)us-gaap_NetIncomeLoss	$ (26,439,159)us-gaap_NetIncomeLoss	$ (28,491,153)us-gaap_NetIncomeLoss
Weighted average shares outstanding used to compute basic and diluted net loss per share									61,612,957us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	43,422,001us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	28,824,417us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share from continuing operations	$ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.04)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.21)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.16)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.97)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Basic and diluted net loss per share from discontinued operations	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Basic and diluted net loss per share	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.04)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.21)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.17)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.17)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.53)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.61)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.99)us-gaap_EarningsPerShareBasicAndDiluted

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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same.

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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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