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EMPLOYEE STOCK COMPENSATION - Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 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) | 123,125 |  | 123,125 |
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) | $ 13.67 |  | $ 13.67 |
Weighted-Average Remaining Contract Term |  |  |  |
Outstanding | 6 years 20 days | 6 years 3 months 19 days |  | 6 years 11 months 18 days
Exercised |  |  | 8 years 2 months 18 days |
Exercisable at end of period | 5 years 9 months |  |  |
Aggregated Intrinsic Value |  |  |  |
Outstanding | $ 1,002 | $ 1,123 | $ 1,002 | $ 1,405
Excercised | 0 |  |  |
Exercisable at end of period | $ 644 |  | $ 644 |

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- Definition Share-based Compensation Arrangements by Share Based Payment Award, Options, Exercises In Period, Weighted Average Remaining Contractual Term + References No definition available. + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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