Stockholders' Equity - Summary of Company's Share Option Plans Activities (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) $ / shares shares
Number of Shares
Share options outstanding at beginning of year (in shares) \| shares	395,625
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	(195,312)
Forfeited/expired (in shares) \| shares	(12,100)
Share options outstanding at end of year (in shares) \| shares	188,213
Share options exercisable at end of year (in shares) \| shares	137,087
Share options unvested at end of year (in shares) \| shares	51,126
Weighted Average Exercise Price
Share options outstanding at beginning of year, weighted average exercise price (usd per share)	$ 6.28
Granted, weighted average exercise price (usd per share)	0.00
Exercised, weighted average exercise price (usd per share)	6.08
Forfeited/expired, weighted average exercise price (usd per share)	17.97
Share options outstanding at end of year, weighted average exercise price (usd per share)	5.72
Share options exercisable at end of year, weighted average exercise price (usd per share)	5.90
Share options unvested at end of year, weighted average exercise price (usd per share)	$ 5.26
Share options outstanding at end of year, weighted-average remaining contractual life	2 years 7 months 14 days
Share options exercisable at end of year, weighted-average remaining contractual life	2 years 4 months
Share options unvested at end of year, weighted-average remaining contractual life	3 years 4 months 26 days
Share options outstanding at end of year \| $	$ 1,870
Share options exercisable at end of year \| $	1,341
Share options unvested at end of year \| $	$ 529
Exercise Price Range One
Number of Shares
Exercise Price, Lower Limit (usd per share)	$ 4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Two
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.35
Exercise Price, Upper Limit (usd pre share)	8.56
Exercise Price Range Three
Number of Shares
Exercise Price, Lower Limit (usd per share)	5.21
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Four
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Five
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Six
Number of Shares
Exercise Price, Lower Limit (usd per share)	4.92
Exercise Price, Upper Limit (usd pre share)	$ 5.61

The weighted-average exercise price as of the balance sheet date for unvested share options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of unvested portions of options.

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Weighted average remaining contractual term for shares options unvested , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen 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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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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Net 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a 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 price at which option holders acquired shares when converting their stock options into shares.

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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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 non-vested options outstanding.

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

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