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Stock-based Compensation and Outstanding Awards - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options, Outstanding, Beginning balance	5,630,000
Stock Options, Granted	1,807,000
Stock OptionsForfeited and Expired	(1,915)
Stock Options, Exercised	(39,000)
Stock Options, Outstanding, Ending balance	5,483,000	5,630,000
Stock Options, Exercisable at December 31, 2017	2,917,000
Weighted average exercise price, Outstanding, Beginning balance	$ 25.97
Weighted average exercise price, Granted	9.90
Weighted average excercise price, Forfeited and Expired	29.79
Weighted average exercise price, Exercised	13.27
Weighted average exercise price, Outstanding, Ending balance	19.43	$ 25.97
Weighted average exercise price, Exercisable at December 31, 2017	$ 25.37
Weighted average remaining contractual term, Outstanding, Ending balance		4 years 8 months 12 days
Weighted average remaining contractual term, Exercisable at December 31, 2017		3 years 9 months 18 days
Aggregate intrinsic value, Outstanding, Ending balance	$ 3

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

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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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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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