SEGMENT AND GEOGRAPHIC DATA - Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) Segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Revenue, from external customers	$ 43,072	$ 51,917
Inter-segment revenue	0	0
Revenue	43,072	51,917
Adjusted net revenue, from external customers	21,764	25,573
Inter-segment adjusted net revenue	0	0
Total adjusted net revenue	21,764	25,573
EBITDA (loss)	499	3,877
Depreciation and amortization	(348)	(324)
Intercompany dividend/interest (expense) income, net	0	0
Interest income, net	64	2
Income before income taxes	215	3,555
Provision for income taxes	139	(536)
Net income	354	3,019
Accounts receivable, net	27,359	26,270	$ 26,270
Long-lived assets, net of accumulated depreciation and amortization	9,762	10,064
Total assets	65,469	67,942	$ 67,942
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0
Inter-segment revenue	15	(96)
Revenue	15	(96)
Adjusted net revenue, from external customers	0	0
Inter-segment adjusted net revenue	3	0
Total adjusted net revenue	3	0
EBITDA (loss)	0	0
Depreciation and amortization	0	0
Intercompany dividend/interest (expense) income, net	0	0
Interest income, net	0	0
Provision for income taxes	0	0
Net income	0	0
Accounts receivable, net	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0
Total assets	0	0
Hudson Americas | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	9,272	14,611
Inter-segment revenue	9	53
Revenue	9,281	14,664
Adjusted net revenue, from external customers	8,922	13,702
Inter-segment adjusted net revenue	9	16
Total adjusted net revenue	8,931	13,718
EBITDA (loss)	(430)	2,414
Depreciation and amortization	(311)	(305)
Intercompany dividend/interest (expense) income, net	0	0
Interest income, net	0	0
Provision for income taxes	228	(42)
Net income	(513)	2,067
Accounts receivable, net	8,570	9,015
Long-lived assets, net of accumulated depreciation and amortization	8,741	9,027
Total assets	21,383	23,775
Hudson Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	27,276	31,133
Inter-segment revenue	0	12
Revenue	27,276	31,145
Adjusted net revenue, from external customers	8,459	8,213
Inter-segment adjusted net revenue	20	(8)
Total adjusted net revenue	8,479	8,205
EBITDA (loss)	1,434	2,027
Depreciation and amortization	(27)	(11)
Intercompany dividend/interest (expense) income, net	(120)	(75)
Interest income, net	2	1
Provision for income taxes	(368)	(531)
Net income	921	1,411
Accounts receivable, net	12,735	10,900
Long-lived assets, net of accumulated depreciation and amortization	954	963
Total assets	24,480	23,662
Hudson Europe | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	6,524	6,173
Inter-segment revenue	(24)	31
Revenue	6,500	6,204
Adjusted net revenue, from external customers	4,383	3,658
Inter-segment adjusted net revenue	(32)	(8)
Total adjusted net revenue	4,351	3,650
EBITDA (loss)	444	147
Depreciation and amortization	(7)	(7)
Intercompany dividend/interest (expense) income, net	0	0
Interest income, net	0	0
Provision for income taxes	(114)	16
Net income	323	156
Accounts receivable, net	6,054	6,355
Long-lived assets, net of accumulated depreciation and amortization	43	49
Total assets	10,049	9,568
Corporate Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0
Inter-segment revenue	0	0
Revenue	0	0
Adjusted net revenue, from external customers	0	0
Inter-segment adjusted net revenue	0	0
Total adjusted net revenue	0	0
EBITDA (loss)	(949)	(711)
Depreciation and amortization	(3)	(1)
Intercompany dividend/interest (expense) income, net	120	75
Interest income, net	62	1
Provision for income taxes	393	21
Net income	(377)	(615)
Accounts receivable, net	0	0
Long-lived assets, net of accumulated depreciation and amortization	24	25
Total assets	$ 9,557	$ 10,937