Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net revenue	$ 300	$ 100	$ 300	$ 100
Operating expenses:
Selling, general and administrative	2,000	1,200	4,100	2,000
Restructuring and other				(100)
Total operating expenses	2,000	1,200	4,100	2,100
Operating loss from continuing operations	(1,700)	(1,100)	(3,800)	(2,000)
Other income (expense):
Interest expense	(600)		(1,100)
Realized income (loss) on investments	500		(1,700)
Defined benefit plan adjustment			(8,500)
Other income, net			100
Total other expense	(100)		(11,200)
Loss from continuing operations before income taxes	(1,800)	(1,100)	(15,000)	(2,000)
Loss from continuing operations	(1,800)	(1,100)	(15,000)	(200)
Discontinued operations:
Income on sale of discontinued operations, net of income taxes		500		10,500
Income from discontinued operations, net of income taxes				500
Income from discontinued operations, net of income taxes		500		11,000
Net income (loss)	(1,800)	(600)	(15,000)	9,000
Less: Net loss attributable to noncontrolling interest	(300)		(700)
Net income (loss) attributable to GlassBridge Enterprises, Inc.	$ (1,500)	$ (600)	$ (14,300)	$ 9,000
Income (loss) per common share attributable to GlassBridge Enterprises, Inc. common shareholders - basic and diluted:
Continuing operations	$ (59.37)	$ (42.80)	$ (567.06)	$ (77.82)
Discontinued operations		19.46		428.02
Net income (loss)	$ (59.37)	$ (23.34)	$ (567.06)	$ 350.20
Weighted average common shares outstanding:
Basic and diluted	25,200	25,700	25,200	25,700