STOCK BASED COMPENSATION - Summary of PSU Activity (Detail) - Performance-Based Restricted Stock Units	12 Months Ended
Dec. 31, 2019 $ / shares shares
Number of Units
Non-vested as of January 1, 2019 \| shares	115,508
Granted \| shares	157,451
Vested and Released \| shares	(65,095)
Forfeited (including performance goal not achieved) \| shares	(91,815)
Non-vested as of December 31, 2019 \| shares	116,049
Weighted Average Grant Date Fair Value Per Share
Non-vested as of January 1, 2019 \| $ / shares	$ 63.77
Granted \| $ / shares	48.59
Vested and Released \| $ / shares	63.38
Forfeited (including performance goal not achieved) \| $ / shares	57.37
Non-vested as of December 31, 2019 \| $ / shares	$ 48.46

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares related to Restricted Stock Award forfeited during the period.

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