ACQUISITION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Oct. 01, 2020
Business Acquisition [Line Items]
Stock-based compensation	$ 699		$ 334	$ 1,795	$ 571
Salaries and related	14,130		8,098	37,001	24,650
Revenue since acquisition date	3,032			6,248
Earnings (loss) since acquisition date	8			496
Restricted common stock
Business Acquisition [Line Items]
Stock-based compensation	59		$ 0	241	$ 0
Coit Staffing, Inc.
Business Acquisition [Line Items]
Fair value of assets acquired and consideration transferred								$ 3,997
Promissory note								1,350
Contingent consideration payable, annual payment								450
Employee agreement		2 years
Transaction costs								$ 436
Stock-based compensation	59			241
Promissory note payment	91			272
Earn-out payment	475			975
Salaries and related	$ 625			$ 1,488
Coit Staffing, Inc. | Forecast
Business Acquisition [Line Items]
Earn out payment						$ 2,030	$ 1,500
Coit Staffing, Inc. | Restricted common stock
Business Acquisition [Line Items]
Stock granted during period, amount, acquisitions		$ 500
Share-based compensation arrangement award vesting period				30 months
Stock granted during period, shares, acquisitions	52,226			52,226
Coit Staffing, Inc. | Restricted common stock | First Anniversary
Business Acquisition [Line Items]
Share-based compensation arrangement award vesting period		10 months
Coit Staffing, Inc. | Restricted common stock | Second Anniversary
Business Acquisition [Line Items]
Share-based compensation arrangement award vesting period		20 months
Coit Staffing, Inc. | Restricted common stock | Third Anniversary
Business Acquisition [Line Items]
Share-based compensation arrangement award vesting period		30 months