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Stock Option Grants - Summary of Stock Option Activity (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Number of Shares
Stock Options Outstanding, Number of Shares, Beginning balance	83,400
Stock Options Granted, Number of Shares	96,150	10,750
Stock Options Forfeited, Number of Shares	2,500
Stock Options Outstanding, Number of Shares, Ending balance	177,050	10,750
Stock Options Exercisable, Number of Shares	81,900
Average Exercise Price
Stock Options Outstanding, Average Exercise Price, Beginning balance	$ 8.09
Stock Options Granted, Average Exercise Price	8.23	$ 8.00
Stock Options Expired, Average Exercise Price	8.09
Stock Options Outstanding, Average Exercise Price, Ending balance	8.16	$ 8.00
Stock Options Exercisable, Average Exercise Price	$ 8.09

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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X

- 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.

+ References

No definition available.

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- Definition

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

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



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



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-Publisher FASB



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-SubTopic 10



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-Paragraph 2



-Subparagraph (c)(1)(i)-(ii)



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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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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i)



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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

+ References

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- Definition

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

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