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Computation of Basic and Diluted Earnings Per Share (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
Basic and diluted net loss per share (in thousands, except per share amounts):
Net loss	$ (13,056)	$ (15,675)	$ (17,164)	$ (20,825)	$ (20,543)	$ (17,791)	$ (15,110)	$ (16,505)	$ (66,720)	$ (69,949)	$ (48,597)
Preferred stock deemed dividend									(8,469)
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)
Denominator for basic and diluted net loss per share allocable to common stockholders:
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
Net loss per share allocable to common stockholders - basic and diluted	$ (0.09)	$ (0.09)	$ (0.09)	$ (0.11)	$ (0.11)	$ (0.10)	$ (0.09)	$ (0.11)	$ (0.38)	$ (0.41)	$ (0.39)
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									72,934	28,275	36,830
Series B Convertible Preferred Stock
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									43,430
Stock Options and Stock Awards
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									17,040	15,561	11,101
Warrant
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									12,464	12,714	25,729

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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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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