Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net revenue	$ 400		$ 700	$ 100
Operating expenses:
Selling, general and administrative	3,000	500	7,100	2,500
Restructuring and other				100
Total operating expenses	3,000	500	7,100	2,600
Operating loss from continuing operations	(2,600)	(500)	(6,400)	(2,500)
Other income (expense):
Interest expense	(700)		(1,800)
Realized loss on investments	(100)		(1,800)
Defined benefit plan adjustment			(8,500)
Other expense, net	(100)
Total other expense	(900)		(12,100)
Loss from continuing operations before income taxes	(3,500)	(500)	(18,500)	(2,500)
Loss from continuing operations	(3,500)	(500)	(18,500)	(2,500)
Discontinued operations:
Income on sale of discontinued operations, net of income taxes				10,500
Income from discontinued operations, net of income taxes		(200)		300
Income from discontinued operations, net of income taxes		(200)		10,800
Net income (loss)	(3,500)	(700)	(18,500)	8,300
Less: Net loss attributable to noncontrolling interest	(200)		(900)
Net income (loss) attributable to GlassBridge Enterprises, Inc.	$ (3,300)	$ (700)	$ (17,600)	$ 8,300
Income (loss) per common share attributable to GlassBridge Enterprises, Inc. common shareholders - basic and diluted:
Continuing operations	$ (131.13)	$ (19.86)	$ (698.19)	$ (99.44)
Discontinued operations		7.95		421.67
Net income (loss)	$ (131.13)	$ (27.81)		$ 322.23
Weighted average common shares outstanding:
Basic and diluted	25,200,000	25,100,000	25,200,000	25,600,000