SEGMENT AND GEOGRAPHIC DATA - Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Revenue, from external customers	$ 48,686	$ 45,010	$ 151,564	$ 119,145
Inter-segment revenue	0	0	0	0
Revenue	48,686	45,010	151,564	119,145
Adjusted net revenue, from external customers	24,199	18,031	77,046	45,840
Inter-segment adjusted net revenue	0	0	0	0
Total adjusted net revenue	24,199	18,031	77,046	45,840
EBITDA (loss)	1,628	1,511	9,713	1,957
Depreciation and amortization	(356)	(117)	(1,017)	(340)
Intercompany dividend/interest (expense) income, net	0	0	0	0
Interest income, net	23	8	28	27
Income before income taxes	1,295	1,402	8,724	1,644
Provision for income taxes	(340)	92	(1,657)	(475)
Net income	955	1,494	7,067	1,169
Accounts receivable, net	29,149	25,748	29,149	25,748	$ 25,748
Long-lived assets, net of accumulated depreciation and amortization	10,357	10,078	10,357	10,078
Total assets	66,963	61,242	66,963	61,242	$ 61,242
Inter-Segment Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(128)	0	(277)	(15)
Revenue	(128)	0	(277)	(15)
Adjusted net revenue, from external customers	0	0	0	0
Inter-segment adjusted net revenue	(30)	0	(26)	0
Total adjusted net revenue	(30)	0	(26)	0
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany dividend/interest (expense) income, net	(5,575)	0	(8,008)	0
Interest income, net	0	0	0	0
Provision for income taxes	0	0	0	0
Net income	(5,575)	0	(8,008)	0
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	12,555	7,423	41,581	17,350
Inter-segment revenue	113	0	212	0
Revenue	12,668	7,423	41,793	17,350
Adjusted net revenue, from external customers	11,926	7,030	39,437	16,232
Inter-segment adjusted net revenue	113	0	174	(15)
Total adjusted net revenue	12,039	7,030	39,611	16,217
EBITDA (loss)	810	604	5,515	153
Depreciation and amortization	(334)	(91)	(960)	(264)
Intercompany dividend/interest (expense) income, net	0	0		0
Interest income, net	0	0	0	0
Provision for income taxes	(31)	596	(99)	579
Net income	445	1,109	4,456	468
Accounts receivable, net	10,467	8,765	10,467	8,765
Long-lived assets, net of accumulated depreciation and amortization	9,351	9,964	9,351	9,964
Total assets	26,762	22,214	26,762	22,214
Hudson Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	29,965	32,273	91,042	86,414
Inter-segment revenue	4	0	16	15
Revenue	29,969	32,273	91,058	86,429
Adjusted net revenue, from external customers	8,324	7,925	25,711	20,563
Inter-segment adjusted net revenue	(93)	0	(146)	15
Total adjusted net revenue	8,231	7,925	25,565	20,578
EBITDA (loss)	1,244	1,809	5,533	3,574
Depreciation and amortization	(14)	(19)	(34)	(50)
Intercompany dividend/interest (expense) income, net	(99)	(81)	(255)	(252)
Interest income, net	0	0	2	2
Provision for income taxes	(307)	(438)	(1,382)	(875)
Net income	824	1,271	3,864	2,399
Accounts receivable, net	12,526	12,073	12,526	12,073
Long-lived assets, net of accumulated depreciation and amortization	909	68	909	68
Total assets	23,263	21,744	23,263	21,744
Hudson Europe | Operating Segments
Segment Reporting Information [Line Items]
Revenue, from external customers	6,166	5,314	18,941	15,381
Inter-segment revenue	11	0	49	0
Revenue	6,177	5,314	18,990	15,381
Adjusted net revenue, from external customers	3,949	3,076	11,898	9,045
Inter-segment adjusted net revenue	10	0	(2)	0
Total adjusted net revenue	3,959	3,076	11,896	9,045
EBITDA (loss)	279	111	977	657
Depreciation and amortization	(7)	(6)	(20)	(23)
Intercompany dividend/interest (expense) income, net	2,793	0	4,007	0
Interest income, net	0	0	0	0
Provision for income taxes	(7)	(24)	(83)	(164)
Net income	3,058	81	4,881	470
Accounts receivable, net	6,156	4,910	6,156	4,910
Long-lived assets, net of accumulated depreciation and amortization	51	42	51	42
Total assets	8,467	9,370	8,467	9,370
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)	(705)	(1,013)	(2,312)	(2,427)
Depreciation and amortization	(1)	(1)	(3)	(3)
Intercompany dividend/interest (expense) income, net	2,881	81	4,256	252
Interest income, net	23	8	26	25
Provision for income taxes	5	(42)	(93)	(15)
Net income	2,203	(967)	1,874	(2,168)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	46	4	46	4
Total assets	$ 8,471	$ 7,914	$ 8,471	$ 7,914