Business Segment Information and Geographic Data - Schedule of Net Revenue, Operating Loss from Continuing Operations and Assets by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Total segment operating loss	$ (49,200)	$ (100)
Corporate and unallocated	(1,500)	(3,200)
Restructuring and other		(100)
Total operating loss	(50,700)	(3,400)
Interest expense	(2,600)	(300)
Realized losses on investments	(1,900)
Defined benefit plan adjustment	(8,500)
Other income (expense), net	100	15,100
Income (loss) from continuing operations before income taxes	(63,600)	11,400
Total segment assets	24,200	67,600
Corporate and unallocated	1,200	8,800
Total consolidated assets	25,400	76,400
Asset Management Business [Member]
Total segment operating loss	(5,200)	100
Total segment assets	15,800	16,800
Sports Technology Platform [Member]
Total segment operating loss	(44,000)	(200)
Total segment assets	$ 8,400	$ 50,800