Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disclosure Computation Of Basic And Diluted Earnings Per Share [Abstract]
Net loss, basic	$ (12,595)	$ (39,672)
Removal of change in fair value of warrant liability	(8,610)
Net loss, diluted	$ (21,205)	$ (39,672)
Weighted average shares used to compute basic net loss per share	85,477	63,778
Effect of dilutive warrants	171
Weighted average shares used to compute diluted net loss per share	85,648	63,778

Disclosure computation of basic and diluted earnings per share.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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