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Stockholders' Equity - Activity Under Stock Option Plans (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Number of Shares Underlying Stock Options
Outstanding beginning balance (shares) | shares	75
Exercised (shares) | shares	(67)
Cancelled or expired (shares) | shares	0
Outstanding ending balance (shares) | shares	8
Vested and expected to vest at December 31, 2013 (shares) | shares	8
Exercisable at December 31, 2013 (shares) | shares	8
Weighted Average Exercise Price per Share
Outstanding beginning balance (usd per share) | $ / shares	$ 11.36
Exercised (usd per share) | $ / shares	11.76
Cancelled or expired (usd per share) | $ / shares	0.00
Outstanding ending balance (usd per share) | $ / shares	8.07
Vested and expected to vest at December 31, 2013 (usd per share) | $ / shares	8.07
Exercisable at December 31, 2013 (usd per share) | $ / shares	$ 8.07
Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2018	1 month 28 days
Vested at December 31, 2018	1 month 28 days
Exercisable at December 31, 2018	1 month 28 days
Aggregate Intrinsic Value
Outstanding as of December 31, 2018 | $	$ 1,649
Vested at December 31, 2018 | $	1,649
Exercisable at December 31, 2018 | $	$ 1,649

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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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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For presentations that combine terminations, 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 or that expired.

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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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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Number of share options (or share units) exercised during the current period.

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