STOCK-BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 695	$ 794	$ 1,241	$ 1,096
Coit Staffing, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	32		74
Restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	32	92	74	182
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 663	$ 702	$ 1,167	$ 914
Restricted stock units | Performance Conditions, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target, Group adjusted EBITDA, percentage	100.00%		100.00%
Restricted stock units, time | Coit Staffing, Inc. | Performance Conditions, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target, Group adjusted EBITDA, percentage	100.00%		100.00%