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Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data [Line Items]
Revenues	$ 2,847	$ 2,927	$ 3,392	$ 2,085	$ 1,806	$ 2,874	$ 2,684	$ 2,350	$ 11,251	$ 9,714	$ 21,614
Net loss	(13,056)	(15,675)	(17,164)	(20,825)	(20,543)	(17,791)	(15,110)	(16,505)	(66,720)	(69,949)	(48,597)
Net loss allocable to common stockholders	$ (21,525)	$ (15,675)	$ (17,164)	$ (20,825)	$ (20,543)	$ (17,791)	$ (15,110)	$ (16,505)	$ (75,189)	$ (69,949)	$ (48,597)
Basic and diluted net loss per share allocable to common stockholders	$ (0.09)	$ (0.09)	$ (0.09)	$ (0.11)	$ (0.11)	$ (0.10)	$ (0.09)	$ (0.11)	$ (0.38)	$ (0.41)	$ (0.39)
Weighted-average common shares outstanding	235,879	183,022	182,913	182,847	180,685	177,870	167,697	155,431	196,275	170,469	125,101

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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