Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Licensing revenue	$ 108,576	$ 148,984
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember
Selling, general and administrative expenses	$ 59,398	$ 84,748
Depreciation and amortization	1,196	1,816
Equity (earnings) loss on joint ventures	1,364	(14)
Gain on sale of investment	(1,600)
Gain on sale of trademarks	(74,105)
Asset impairment	62	1,766
Investment impairment	19,607	26,613
Trademark impairment	35,053	65,587
Operating income (loss)	67,601	(31,532)
Other expenses (income):
Interest expense	67,694	56,921
Interest income	(52)	(360)
Other loss, net	3,570	5,291
Foreign currency translation loss	1,570	858
Other expenses – net	72,782	62,710
Loss before income taxes	(5,181)	(94,242)
(Benefit) Provision for income taxes	(2,205)	5,683
Net loss	(2,976)	(99,925)
Less: Net income attributable to non-controlling interest	4,360	9,597
Net loss attributable to Iconix Brand Group, Inc.	$ (7,336)	$ (109,522)
Loss per share:
Basic	$ (0.60)	$ (10.37)
Diluted	$ (0.60)	$ (10.37)
Weighted average number of common shares outstanding:
Basic	12,334	10,559
Diluted	12,334	10,559