BROKER DEALERS (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) subsidiary	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Number Of Broker-Dealer Subsidiary | subsidiary	3
SpeedRoute
Related Party Transaction [Line Items]
Actual net capital	$ 1,725,000	$ 850,000
Minimum required net capital	229,000	145,000
Amount in excess of required net capital	$ 1,496,000	$ 705,000
Net capital ratio	1.99	2.56
tZERO ATS, LLC
Related Party Transaction [Line Items]
Actual net capital	$ 863,000	$ 110,000
Minimum required net capital	5,000	5,000
Amount in excess of required net capital	$ 858,000	$ 105,000
Net capital ratio	0.03	0.27
tZERO Markets, LLC
Related Party Transaction [Line Items]
Actual net capital	$ 2,418,000	$ 0
Minimum required net capital	50,000	0
Amount in excess of required net capital	$ 2,368,000	$ 0
Net capital ratio	0.04	0