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Summary of Stock Options Summarized by Exercise Price (Detail) - Incentive Stock Options - $ / shares	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Weighted Average, Shares	482,218
Outstanding Weighted Average, Exercise Price	$ 9.46	$ 9.43	$ 9.37	$ 9.33
Exercisable Weighted Average, Shares	284,384
Exercisable Weighted Average, Exercise Price	$ 8.05	$ 8.03	$ 7.99	$ 7.97
Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	$ 7.50
Outstanding Weighted Average, Shares	250,050
Outstanding Weighted Average, Remaining Life (Months)	38 months
Outstanding Weighted Average, Exercise Price	$ 7.5
Exercisable Weighted Average, Shares	250,050
Exercisable Weighted Average, Exercise Price	$ 7.50
Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share, Lower Range	11.32
Exercise Price Per Share, Upper Range	$ 14.75
Outstanding Weighted Average, Shares	232,168
Outstanding Weighted Average, Remaining Life (Months)	83 months
Outstanding Weighted Average, Exercise Price	$ 11.58
Exercisable Weighted Average, Shares	34,334
Exercisable Weighted Average, Exercise Price	$ 12.07

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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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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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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)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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