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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding at beginning of period (in shares)	186,973
Forfeited (in shares)	(16,000)
Outstanding at end of period (in shares)	170,973	186,973
Exercisable at end of period (in shares)	123,125
Weighted-Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 13.54
Forfeited (in dollars per share)	13.29
Outstanding at end of period (in dollars per share)	13.56	$ 13.54
Exercisable at end of period (in dollars per share)	$ 13.67
Weighted-Average Remaining Contract Term
Outstanding	5 years 6 months	5 years 9 months 22 days
Forfeited	6 years 1 month
Exercisable at end of period	5 years 3 months
Aggregated Intrinsic Value
Outstanding	$ 47
Exercisable at end of period	$ 21

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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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Share-based Compensation Arrangements by Share Based Payment Award, Options, Forfeited In Period, Weighted Average Remaining Contractual Term

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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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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.

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

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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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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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