GOODWILL AND INTANGIBLE ASSETS (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 31,586	$ 25,456
Accumulated Amortization	(17,346)	(15,374)
Total amortization	14,240	10,082
Business relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,918	9,918
Accumulated Amortization	(3,571)	(2,841)
Total amortization	$ 6,347	$ 7,077
Weighted Average Remaining Life	8 years	8 years 7 months 6 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,709	$ 7,832
Accumulated Amortization	(5,934)	(4,959)
Total amortization	$ 1,775	$ 2,873
Weighted Average Remaining Life	1 year 6 months	2 years 2 months 12 days
Licensing agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,129
Accumulated Amortization	(54)
Total amortization	$ 6,075
Weighted Average Remaining Life	9 years 4 months 24 days
Content
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,938	$ 3,814
Accumulated Amortization	(3,938)	(3,814)
Total amortization	$ 0	$ 0
Weighted Average Remaining Life	0 years	0 years
Domains and data licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,869	$ 2,869
Accumulated Amortization	(2,826)	(2,748)
Total amortization	$ 43	$ 121
Weighted Average Remaining Life	2 years	1 year 8 months 12 days
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 877	$ 877
Accumulated Amortization	(877)	(872)
Total amortization	$ 0	$ 5
Weighted Average Remaining Life	0 years	2 months 12 days
User relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 146	$ 146
Accumulated Amortization	(146)	(140)
Total amortization	$ 0	$ 6
Weighted Average Remaining Life	0 years	2 months 12 days