SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) segments	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments		3	3
Revenue, from external customers	$ 66,932			$ 59,615
Revenue from Related Parties	0			0
Total revenue	66,932			59,615
Gross profit, from external customers	42,104			42,060
Inter-segment gross profit	0			0
Gross profit	42,104			42,060
Gain (loss) on sale and exit of businesses	13,861			0
Business reorganization	0			(109)
Goodwill, Impairment Loss	0			1,909
EBITDA (loss) (a)	(5,449)			(1,606)
Depreciation and amortization	16			361
Intercompany interest income (expense), net	0			0
Interest income (expense), net	298			(8)
Income (loss) from continuing operations before provision for income taxes	(5,167)			(1,975)
Provision for (benefit from) income taxes from continuing operations	99			869
Accounts receivable, net	9,893	$ 9,893	$ 9,893	11,545
Total assets	53,179	53,179	53,179	111,640
Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	13,924			16,196
Revenue from Related Parties	20			47
Total revenue	13,944			16,243
Gross profit, from external customers	11,726			14,419
Inter-segment gross profit	20			29
Gross profit	11,746			14,448
Business reorganization				(82)
EBITDA (loss) (a)	440			1,578
Depreciation and amortization	4			2
Intercompany interest income (expense), net	0			0
Interest income (expense), net	0			0
Income (loss) from continuing operations before provision for income taxes	436			1,576
Provision for (benefit from) income taxes from continuing operations	(12)			63
Accounts receivable, net	2,548	2,548	2,548	3,112
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	36,946			29,767
Revenue from Related Parties	0			0
Total revenue	36,946			29,767
Gross profit, from external customers	21,936			19,391
Inter-segment gross profit	(20)			0
Gross profit	21,916			19,391
Business reorganization				0
EBITDA (loss) (a)	2,221			4,770
Depreciation and amortization	3			0
Intercompany interest income (expense), net	(317)			0
Interest income (expense), net	0			0
Income (loss) from continuing operations before provision for income taxes	1,901			4,770
Provision for (benefit from) income taxes from continuing operations	289			356
Accounts receivable, net	4,644	4,644	4,644	4,664
Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	16,062			13,652
Revenue from Related Parties	0			0
Total revenue	16,062			13,652
Gross profit, from external customers	8,442			8,250
Inter-segment gross profit	0			(28)
Gross profit	8,442			8,222
Business reorganization				(5)
EBITDA (loss) (a)	(450)			923
Depreciation and amortization	9			0
Intercompany interest income (expense), net	0			0
Interest income (expense), net	0			0
Income (loss) from continuing operations before provision for income taxes	(459)			923
Provision for (benefit from) income taxes from continuing operations	22			60
Accounts receivable, net	2,701	2,701	2,701	3,769
Corporate
Segment Reporting Information [Line Items]
Revenue, from external customers	0			0
Revenue from Related Parties	0			0
Total revenue	0			0
Gross profit, from external customers	0			0
Inter-segment gross profit	0			0
Gross profit	0			0
Business reorganization				(22)
EBITDA (loss) (a)	(7,660)			(8,877)
Depreciation and amortization	0			359
Intercompany interest income (expense), net	317			0
Interest income (expense), net	298			(8)
Income (loss) from continuing operations before provision for income taxes	(7,045)			(9,244)
Provision for (benefit from) income taxes from continuing operations	(200)			390
Accounts receivable, net	0	0	0	0
Inter-segment elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0			0
Revenue from Related Parties	(20)			(47)
Total revenue	(20)			(47)
Gross profit, from external customers	0			0
Inter-segment gross profit	0			(1)
Gross profit	0			(1)
Business reorganization				0
EBITDA (loss) (a)	0			0
Depreciation and amortization	0			0
Intercompany interest income (expense), net	0			0
Interest income (expense), net	0			0
Income (loss) from continuing operations before provision for income taxes	0			0
Provision for (benefit from) income taxes from continuing operations	0			0
Accounts receivable, net	0	0	0	0
Continuing Operations
Segment Reporting Information [Line Items]
Total assets	52,238	52,238	52,238	18,209
Continuing Operations | Hudson Americas
Segment Reporting Information [Line Items]
Total assets	4,691	4,691	4,691	5,892
Continuing Operations | Hudson Asia Pacific
Segment Reporting Information [Line Items]
Total assets	10,118	10,118	10,118	5,007
Continuing Operations | Hudson Europe
Segment Reporting Information [Line Items]
Total assets	7,773	7,773	7,773	5,150
Continuing Operations | Corporate
Segment Reporting Information [Line Items]
Total assets	29,656	29,656	29,656	2,160
Continuing Operations | Inter-segment elimination
Segment Reporting Information [Line Items]
Total assets	$ 0	$ 0	$ 0	$ 0