BUSINESS SEGMENTS - Reconciles segment gross profit to net income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
BUSINESS SEGMENTS
Segment gross profit (loss)	$ 24,632	$ 26,505	$ 75,205	$ 39,663
Selling, general and administrative expenses	(22,803)	(13,377)	(53,079)	(40,614)
Payroll support program proceeds		(6,347)	(14,768)	(12,693)
Transaction costs		(219)		(434)
Interest expense, net	(241)	(267)	(750)	(1,307)
Other income, net	9	206	258	358
Change in fair value of warrant liability	(2,104)		(2,735)
Income tax (expense) benefit	(1,129)	(4,476)	(8,737)	(2,519)
Net income (loss)	$ (1,636)	$ 14,719	$ 24,930	$ 7,840

Amount of proceeds under payroll support program received by the company recognized during the period.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The net amount of nonoperating interest income (expense).

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Amount of income (expense) related to nonoperating activities, classified as other.

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- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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