BROKER DEALERS (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) subsidiary	Dec. 31, 2019 USD ($) subsidiary
Related Party Transaction [Line Items]
Number Of Broker-Dealer Subsidiary | subsidiary	2	2
SpeedRoute
Related Party Transaction [Line Items]
Actual net capital	$ 1,427	$ 850
Minimum required net capital	370	145
Amount in excess of required net capital	$ 1,057	$ 705
Net capital ratio	3.88	2.56
tZERO ATS, LLC [Member]
Related Party Transaction [Line Items]
Actual net capital	$ 66	$ 110
Minimum required net capital	5	5
Amount in excess of required net capital	$ 61	$ 105
Net capital ratio	0.28	0.27