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Net Loss and the Number of Shares Used to Compute Basic and Diluted Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net loss	$ (13,354)	$ (31,512)	$ (43,125)	$ (62,638)
Preferred stock purchase option (see Note 8)				(868)
Preferred stock beneficial conversion feature (see Note 8)		(31,341)		(31,341)
Net loss applicable to common shareholders-basic	(13,354)	(62,853)	(43,125)	(94,847)
Gain on warrant derivative liability				(119)
Net loss-diluted	$ (13,354)	$ (62,853)	$ (43,125)	$ (94,966)
Net loss per share-basic and diluted	$ (0.07)	$ (0.35)	$ (0.23)	$ (0.53)
Weighted average shares outstanding-basic and diluted	184,471	180,464	184,262	178,036

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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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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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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period.

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