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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Number of Shares
Outstanding at beginning of period (in shares)	186,973	210,973	210,973
Exercised (in shares)			(24,000)
Outstanding at end of period (in shares)	186,973	186,973	186,973	210,973
Exercisable at end of period (in shares)	113,649		113,649
Weighted-Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 13.54	$ 13.99	$ 13.99
Exercised (in dollars per share)			17.50
Outstanding at end of period (in dollars per share)	13.54	$ 13.54	13.54	$ 13.99
Exercisable at end of period (in dollars per share)	$ 13.69		$ 13.69
Weighted-Average Remaining Contract Term
Outstanding	6 years 3 months 19 days	6 years 6 months 19 days		6 years 11 months 18 days
Exercised			8 years 2 months
Exercisable at end of period	6 years
Aggregated Intrinsic Value
Outstanding	$ 1,123	$ 1,077	$ 1,123	$ 1,405
Excercised	0
Exercisable at end of period	$ 667		$ 667

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Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term [Abstract]

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

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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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