SEGMENT AND GEOGRAPHIC DATA - Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Revenue, from external customers	$ 35,712	$ 44,897	$ 69,603	$ 87,969
Inter-segment revenue	0	0	0	0
Revenue	35,712	44,897	69,603	87,969
Adjusted net revenue, from external customers	17,615	22,583	33,945	44,347
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	17,615	22,583	33,945	44,347
EBITDA (loss)	5	1,659	(2,677)	2,158
Depreciation and amortization	(287)	(354)	(684)	(702)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	94	130	187	194
(Loss) income before income taxes	(188)	1,435	(3,174)	1,650
Provision for income taxes	(253)	(857)	(165)	(718)
Net (loss) income	(441)	578	(3,339)	932
Accounts receivable, net	24,512	19,710	24,512	19,710	$ 19,710
Long-lived assets, net of accumulated depreciation and amortization	9,100	9,798	9,100	9,798
Total assets	56,130	60,958	56,130	60,958	$ 60,958
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(93)	(102)	(148)	(87)
Revenue	(93)	(102)	(148)	(87)
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	0	(29)	0	(26)
Total adjusted net revenue	0	(29)	0	(26)
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany dividend/interest (expense) income, net	0	(1,218)	0	(1,218)
Interest income, net	0	0	0	0
Provision for income taxes	0	0	0	0
Net (loss) income	0	(1,218)	0	(1,218)
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	6,972	8,569	12,966	17,841
Inter-segment revenue	59	102	114	111
Revenue	7,031	8,671	13,080	17,952
Adjusted net revenue, from external customers	6,344	8,321	12,149	17,243
Inter-segment adjusted net revenue	58	102	113	111
Total adjusted net revenue	6,402	8,423	12,262	17,354
EBITDA (loss)	402	(466)	(462)	(896)
Depreciation and amortization	(232)	(312)	(581)	(623)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	0	0	0	0
Provision for income taxes	(52)	(73)	(67)	155
Net (loss) income	118	(851)	(1,110)	(1,364)
Accounts receivable, net	5,234	5,502	5,234	5,502
Long-lived assets, net of accumulated depreciation and amortization	7,192	7,773	7,192	7,773
Total assets	14,146	17,632	14,146	17,632
Hudson Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	22,649	28,402	44,158	55,678
Inter-segment revenue	0	0	0	0
Revenue	22,649	28,402	44,158	55,678
Adjusted net revenue, from external customers	7,627	9,581	14,173	18,040
Inter-segment adjusted net revenue	(92)	(58)	(139)	(38)
Total adjusted net revenue	7,535	9,523	14,034	18,002
EBITDA (loss)	224	2,131	(377)	3,565
Depreciation and amortization	(46)	(32)	(84)	(59)
Intercompany dividend/interest (expense) income, net	(131)	(127)	(263)	(247)
Interest income, net	2	2	5	4
Provision for income taxes	(16)	(552)	201	(920)
Net (loss) income	33	1,422	(518)	2,343
Accounts receivable, net	12,736	9,280	12,736	9,280
Long-lived assets, net of accumulated depreciation and amortization	1,845	1,954	1,845	1,954
Total assets	23,479	23,604	23,479	23,604
Hudson Europe | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	6,091	7,926	12,479	14,450
Inter-segment revenue	34	0	34	(24)
Revenue	6,125	7,926	12,513	14,426
Adjusted net revenue, from external customers	3,644	4,681	7,623	9,064
Inter-segment adjusted net revenue	34	(15)	26	(47)
Total adjusted net revenue	3,678	4,666	7,649	9,017
EBITDA (loss)	149	851	417	1,295
Depreciation and amortization	(7)	(8)	(14)	(15)
Intercompany dividend/interest (expense) income, net	0	1,218	0	1,218
Interest income, net	0	0	0	0
Provision for income taxes	(167)	(299)	(253)	(413)
Net (loss) income	(25)	1,762	150	2,085
Accounts receivable, net	6,542	4,928	6,542	4,928
Long-lived assets, net of accumulated depreciation and amortization	31	33	31	33
Total assets	10,751	11,064	10,751	11,064
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)	(770)	(857)	(2,255)	(1,806)
Depreciation and amortization	(2)	(2)	(5)	(5)
Intercompany dividend/interest (expense) income, net	131	127	263	247
Interest income, net	92	128	182	190
Provision for income taxes	(18)	67	(46)	460
Net (loss) income	(567)	(537)	(1,861)	(914)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	32	38	32	38
Total assets	$ 7,754	$ 8,658	$ 7,754	$ 8,658