Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Initial Carrying Value	$ 11,800	$ 11,800
Cumulative Foreign Currency Translation Adjustment	199	713
Accumulated Amortization	(1,995)	(798)
Net Carrying Value	$ 10,004	$ 11,715
Customer relationships - institutional
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	14 years	14 years
Gross Initial Carrying Value	$ 3,200	$ 3,200
Cumulative Foreign Currency Translation Adjustment	57	197
Accumulated Amortization	(390)	(156)
Net Carrying Value	$ 2,867	$ 3,241
Customer relationships - non-institutional
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	10 years	10 years
Gross Initial Carrying Value	$ 4,400	$ 4,400
Cumulative Foreign Currency Translation Adjustment	74	266
Accumulated Amortization	(759)	(304)
Net Carrying Value	$ 3,715	$ 4,362
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	10 years	10 years
Gross Initial Carrying Value	$ 1,500	$ 1,500
Cumulative Foreign Currency Translation Adjustment	25	90
Accumulated Amortization	(259)	(103)
Net Carrying Value	$ 1,266	$ 1,487
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	8 years	8 years
Gross Initial Carrying Value	$ 2,700	$ 2,700
Cumulative Foreign Currency Translation Adjustment	43	160
Accumulated Amortization	(587)	(235)
Net Carrying Value	$ 2,156	$ 2,625