Fair Value Measurements (Details) - USD ($) $ in Thousands, shares in Millions			1 Months Ended		9 Months Ended
	Dec. 26, 2019	Jun. 30, 2019	Jul. 31, 2019	Apr. 30, 2019	Sep. 30, 2020
Fair Value Measurements
Number of common stock issued		0.6
DBOT
Fair Value Measurements
Contingent consideration					$ 777
Number of common stock issued			1.4	4.4	13.1
Tree Technologies
Fair Value Measurements
Contingent consideration					$ 10,913
Number of common stock issued	9.5
Level I | DBOT
Fair Value Measurements
Contingent consideration					0
Level I | Tree Technologies
Fair Value Measurements
Contingent consideration					0
Level II | DBOT
Fair Value Measurements
Contingent consideration					0
Level II | Tree Technologies
Fair Value Measurements
Contingent consideration					0
Level III | DBOT
Fair Value Measurements
Contingent consideration					777
Level III | Tree Technologies
Fair Value Measurements
Contingent consideration					$ 10,913