The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	Oct. 01, 2020
Goodwill [Line Items]
Goodwill	$ 2,088	$ 2,088	$ 2,088
Amortization expense of intangible assets	$ 80	$ 240
Non-compete agreements
Goodwill [Line Items]
Amortization period, over		2 years
Trade name
Goodwill [Line Items]
Amortization period, over		5 years
Customer lists
Goodwill [Line Items]
Amortization period, over		5 years
Coit Staffing, Inc.
Goodwill [Line Items]
Goodwill				$ 2,088