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STOCK-BASED COMPENSATION AND EQUITY - Total Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | $ 1,038 | $ 1,864 | $ 2,162 | $ 5,284
Less: income tax effect | (228) | (410) | (476) | (1,162)
Net stock-based compensation expense | 810 | 1,454 | 1,686 | 4,122
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | 7,600 |  | $ 7,600 |
Period for recognition for which unrecognized compensation costs are expected to be recognized |  |  | 2 years |
Costs of revenue (exclusive of amortization and depreciation) |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | 237 | 274 | $ 558 | 851
Other expenses |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Pre-tax stock-based compensation expense | $ 801 | $ 1,590 | $ 1,604 | $ 4,433

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