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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, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic and diluted net loss per share (in thousands, except per share amounts):
Net loss	$ (20,543)	$ (17,791)	$ (15,110)	$ (16,505)	$ (4,267)	$ (15,229)	$ (10,635)	$ (18,466)	$ (69,949)	$ (48,597)	$ (57,308)
Denominator for basic and diluted net loss per share:
Weighted-average common shares outstanding	180,685	177,870	167,697	155,431	142,482	124,069	117,864	115,726	170,469	125,101	82,463
Basic and diluted net loss per share	$ (0.11)	$ (0.10)	$ (0.09)	$ (0.11)	$ (0.03)	$ (0.12)	$ (0.09)	$ (0.16)	$ (0.41)	$ (0.39)	$ (0.69)
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									28,275	36,830	33,022
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									15,561	11,101	7,288
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									12,714	25,729	25,734

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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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