Business Segment Information and Geographic Data - Schedule of Net Revenue and Operating Income (Loss) by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net revenue
Operating loss from continuing operations	(8,300)	(8,700)
Intangible impairment	(6,300)	(2,700)
Restructuring and other	4,800	200
Interest expense	(100)
Net income (loss) from GBAM Fund activities	(900)	1,200
Other income (expense), net	500	(500)
Loss from continuing operations before income taxes	(8,800)	(8,000)
Operating Segments [Member]
Operating loss from continuing operations	(3,600)	(4,300)
Operating Segments [Member] | Asset Management Business [Member]
Net revenue
Operating loss from continuing operations	(3,600)	(4,300)
Corporate and Unallocated [Member]
Operating loss from continuing operations	(3,300)	(4,600)
Segment Reconciling Items [Member]
Intangible impairment	(6,200)
Restructuring and other	$ 4,800	$ 200