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

No definition available.

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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.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

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.

+ References

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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- Definition

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

+ References

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- Definition

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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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The ceiling 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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- Definition

Number of non-vested options outstanding.

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No definition available.

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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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Summary of Company's Share Option Plans Activities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share options outstanding at beginning of year	935,095
Granted (in shares)	0	0	324,000
Exercised (in shares)	(293,625)
Forfeited/expired (in shares)	(245,845)
Share options outstanding at end of year	395,625	935,095
Share options exercisable at end of year	261,500
Share options unvested at end of year	134,125
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share options outstanding at beginning of year, weighted average exercise price (usd per share)	$ 8.27
Granted, weighted average exercise price (usd per share)	0.00
Exercised, weighted average exercise price (usd per share)	7.27
Forfeited/expired, weighted average exercise price (usd per share)	12.68
Share options outstanding at end of year, weighted average exercise price (usd per share)	6.28	$ 8.27
Share options exercisable at end of year, weighted average exercise price (usd per share)	6.91
Share options unvested at end of year, weighted average exercise price (usd per share)	$ 5.04
Share options outstanding at end of year, weighted-average remaining contractual life (in years)	3 years 2 months 4 days
Share options exercisable at end of year, weighted-average remaining contractual life (in years)	2 years 8 months 2 days
Share options unvested at end of year, weighted-average remaining contractual life (in years)	4 years 2 months 3 days
Share options outstanding at end of year	$ 4,031,858
Share options exercisable at end of year	2,509,977
Share options unvested at end of year	$ 1,521,881
Exercise Price Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	$ 4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	4.35
Exercise Price, Upper Limit (usd pre share)	8.56
Exercise Price Range Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	4.35
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	22.50
Exercise Price Range Six [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise Price, Lower Limit (usd per share)	4.16
Exercise Price, Upper Limit (usd pre share)	$ 5.61