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Stock Option Grants - Summary of Stock Option Activity (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Number of Shares
Stock Options Outstanding, Number of Shares, Beginning balance	83,400
Stock Options Granted, Number of Shares	96,150	83,400
Stock Options Forfeited, Number of Shares	2,500
Stock Options Outstanding, Number of Shares, Ending balance	177,050	83,400
Stock Options Exercisable, Number of Shares	81,900	72,650
Average Exercise Price
Stock Options Outstanding, Average Exercise Price, Beginning balance	$ 8.09
Stock Options Granted, Average Exercise Price	8.23	$ 8.09
Stock Options Forfeited, Average Exercise Price	8.09
Stock Options Outstanding, Average Exercise Price, Ending balance	8.16	8.09
Stock Options Exercisable, Average Exercise Price	$ 8.09	$ 8.10

X

- 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)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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=6415400&loc=d3e5070-113901

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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



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(3)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

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

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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- Definition

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

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



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-Subparagraph (c)(1)(i)



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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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