SEGMENT AND GEOGRAPHIC DATA - Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Revenue, from external customers	$ 39,398	$ 48,686	$ 127,367	$ 157,326
Inter-segment revenue	0	0	0	0
Revenue	39,398	48,686	127,367	157,326
Adjusted net revenue, from external customers	19,370	24,199	63,717	77,046
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	19,370	24,199	63,717	77,046
EBITDA (loss)	1,247	1,628	3,405	9,713
Depreciation and amortization	(374)	(356)	(1,076)	(1,017)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	90	23	284	28
Income before income taxes	963	1,295	2,613	8,724
Provision for income taxes	(430)	(340)	(1,148)	(1,657)
Net income	533	955	1,465	7,067
Accounts receivable, net	24,889	26,270	24,889	26,270	$ 26,270
Long-lived assets, net of accumulated depreciation and amortization	9,043	10,064	9,043	10,064
Total assets	60,756	67,942	60,756	67,942	$ 67,942
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(137)	(128)	(224)	(277)
Revenue	(137)	(128)	(224)	(277)
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	9	(30)	(17)	(26)
Total adjusted net revenue	9	(30)	(17)	(26)
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany dividend/interest (expense) income, net	0	(5,575)	(1,218)	(8,008)
Interest income, net	0	0	0	0
Provision for income taxes	0	0	0	0
Net income	0	(5,575)	(1,218)	(8,008)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0	0	0
Total assets	0	0	0	0
Hudson Americas | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	7,167	12,555	25,008	41,581
Inter-segment revenue	119	113	230	212
Revenue	7,286	12,668	25,238	41,793
Adjusted net revenue, from external customers	6,854	11,926	24,097	39,437
Inter-segment adjusted net revenue	119	113	230	174
Total adjusted net revenue	6,973	12,039	24,327	39,611
EBITDA (loss)	20	810	(876)	5,515
Depreciation and amortization	(313)	(334)	(936)	(960)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	0	0	0	0
Provision for income taxes	(44)	(31)	111	(99)
Net income	(337)	445	(1,701)	4,456
Accounts receivable, net	6,020	9,015	6,020	9,015
Long-lived assets, net of accumulated depreciation and amortization	8,119	9,027	8,119	9,027
Total assets	18,594	23,775	18,594	23,775
Hudson Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	26,106	29,965	81,784	91,042
Inter-segment revenue	0	4	0	16
Revenue	26,106	29,969	81,784	91,058
Adjusted net revenue, from external customers	8,694	8,324	26,734	25,711
Inter-segment adjusted net revenue	(109)	(93)	(147)	(146)
Total adjusted net revenue	8,585	8,231	26,587	25,565
EBITDA (loss)	1,890	1,244	5,455	5,533
Depreciation and amortization	(52)	(14)	(111)	(34)
Intercompany dividend/interest (expense) income, net	(128)	(99)	(375)	(255)
Interest income, net	2	0	6	2
Provision for income taxes	(520)	(307)	(1,440)	(1,382)
Net income	1,192	824	3,535	3,864
Accounts receivable, net	12,674	10,900	12,674	10,900
Long-lived assets, net of accumulated depreciation and amortization	867	963	867	963
Total assets	23,759	23,662	23,759	23,662
Hudson Europe | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	6,125	6,166	20,575	24,703
Inter-segment revenue	18	11	(6)	49
Revenue	6,143	6,177	20,569	24,752
Adjusted net revenue, from external customers	3,822	3,949	12,886	11,898
Inter-segment adjusted net revenue	(19)	10	(66)	(2)
Total adjusted net revenue	3,803	3,959	12,820	11,896
EBITDA (loss)	(300)	279	995	977
Depreciation and amortization	(7)	(7)	(22)	(20)
Intercompany dividend/interest (expense) income, net	0	2,793	1,218	4,007
Interest income, net	0	0	0	0
Provision for income taxes	26	(7)	(387)	(83)
Net income	(281)	3,058	1,804	4,881
Accounts receivable, net	6,195	6,355	6,195	6,355
Long-lived assets, net of accumulated depreciation and amortization	39	49	39	49
Total assets	9,912	9,568	9,912	9,568
Corporate Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	0	0	0	0
Revenue	0	0	0	0
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	0	0	0	0
EBITDA (loss)	(363)	(705)	(2,169)	(2,312)
Depreciation and amortization	(2)	(1)	(7)	(3)
Intercompany dividend/interest (expense) income, net	128	2,881	375	4,256
Interest income, net	88	23	278	26
Provision for income taxes	108	5	568	(93)
Net income	(41)	2,203	(955)	1,874
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	18	25	18	25
Total assets	$ 8,491	$ 10,937	$ 8,491	$ 10,937