STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION PLANS - Restricted Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Outstanding Restricted Stock Awards and Units
Beginning balance (in shares)	24,615	14,066
Granted (in shares)	3,000	21,125
Vested (in shares)	(14,478)	(5,723)
Forfeited (in shares)	(6,778)	(4,853)
Ending balance (in shares)	6,359	24,615
Weighted-Average Grant Date Fair Value Per Share
Beginning balance (in usd per share)	$ 80.23	$ 138.69
Granted (in usd per share)	33.30	71.36
Vested (in usd per share)	64.16	158.47
Forfeited (in usd per share)	82.44	118.85
Ending balance (in usd per share)	$ 92.29	$ 80.23
Outstanding Aggregate Intrinsic Value
Beginning balance (in usd per share)	$ 82	$ 719	$ 1,183
Vested (in usd per share)	240	420
Ending balance (in usd per share)	82	719
Total fair value of restricted shares vested	$ 929	$ 907

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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