Stock-based Compensation and Outstanding Awards - Summary of Stock Option Activity (Detail)	12 Months Ended
Dec. 31, 2020 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options, Outstanding, Beginning balance \| shares	5,126,000
Stock Options, Granted \| shares	697,000
Stock Options, Forfeited and Expired \| shares	(1,437,000)
Stock Options, Outstanding, Ending balance \| shares	4,386,000
Stock Options, Exercisable at December 31, 2020 \| shares	3,166,000
Weighted average exercise price, Outstanding, Beginning balance \| $ / shares	$ 20.11
Weighted average exercise price, Granted \| $ / shares	9.53
Weighted average exercise price, Forfeited and Expired \| $ / shares	21.61
Weighted average exercise price, Outstanding, Ending balance \| $ / shares	17.93
Weighted average exercise price, Exercisable at December 31, 2020 \| $ / shares	$ 20.70
Weighted average remaining contractual term, Outstanding, Ending balance	3 years 4 months 20 days
Weighted average remaining contractual term, Exercisable at December 31, 2020	2 years 7 months 20 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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