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Stock Incentive Plans and Stock Purchase Plans - Schedule of Activity and Certain Other Information Related to Stock Option Awards (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares, Outstanding at January 1, 2020 | shares	72,808
Number of Stock Options Awarded | shares	982,731
Number of Stock Options Expired | shares	(56,248)
Number of Shares, Outstanding at December 31, 2020 | shares	999,291
Number of Shares, Exercisable at December 31, 2020 | shares	16,560
Weighted Average Exercise Price, Outstanding at January 1, 2020	$ 32.49
Weighted Average Exercise Price Awarded	16.99
Weighted Average Exercise Price Expired	31.39
Weighted Average Exercise Price, Outstanding at December 31, 2020	17.30
Weighted Average Exercise Price, Exercisable at December 31, 2020	$ 36.25
Weighted Average Remaining Contractual Term (in years), Outstanding at December 31, 2020	2 years 6 months 29 days
Weighted Average Remaining Contractual Term (in years), Exercisable at December 31, 2020	4 months 2 days
Aggregate Intrinsic Value Expired	$ 0
Aggregate Intrinsic Value, Outstanding at December 31, 2020 | $	$ 7.4
Aggregate Intrinsic Value, Exercisable at December 31, 2020 | $	$ 0.0

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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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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