STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2020	Dec. 31, 2022		Dec. 31, 2021	May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance to participants			235,200			250,000
Granted, number of share of restricted stock (units)			55,410
Total			$ 2,318		$ 2,424
Coit Staffing, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total		$ 108			$ 283
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)			65,494		198,390
Total			$ 2,210		$ 2,141
Unrecognized Expense			$ 1,519		$ 1,602
Weighted Average Period in Years			9 months 18 days		1 year 1 month 6 days
Restricted stock units, type 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)	[1],[2]		34,493
Restricted stock units, type 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)	[1],[2]		15,667
Restricted stock units, time
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)			5,250	[2]	47,500
Non employee director restricted stock unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)			10,084		24,219
Non-option equity instruments, outstanding, number			224,370
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total			$ 108		$ 283
Unrecognized Expense			$ 16		$ 125
Weighted Average Period in Years			2 months 12 days		9 months 18 days
Restricted stock | Coit Staffing, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted during period, shares, acquisitions			52,226
Restricted stock units, type 1 and 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)			50,160
First Anniversary | Restricted stock units, type 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)			53,075
First Anniversary | Restricted stock units, type 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, number of share of restricted stock (units)					73,596

[1] The performance conditions with respect to restricted stock units may be satisfied as follows: (a)For employees from the Americas, Asia Pacific, and Europe 70% of the restricted stock units may be earned on the basis of performance as measured by a “regional adjusted EBITDA”, and 30% of the restricted stock units may be earned on the basis of performance as measured by a “group adjusted EBITDA”; and (b)For grants to Corporate office employees subject to 2022 performance conditions, 100% of the restricted stock units may be earned on the basis of performance as measured by a “group adjusted EBITDA”; and (c)For grants to Coit Staffing Principals subject to 2022 performance conditions, 100% of the restricted stock units may be earned on the basis of performance as measured by a “Coit EBITDA”.

[2] To the extent restricted stock units are earned, such restricted stock units will vest on the basis of service as follows: (a)33% and 66.6% for Type 1 and Type 2, respectively, of the restricted stock units will vest on the first anniversary of the grant date; (b)33% and 16.7% for Type 1 and Type 2, respectively, of the restricted stock units will vest on the second anniversary of the grant date; and (c)34% and 16.7% for Type 1 and Type 2, respectively, of the restricted stock units will vest on the third anniversary of the grant date; provided that, in each case, the employee remains employed by the Company from the grant date through the applicable service vesting date.