Fair Value Measurements (Details) - USD ($) $ in Thousands, shares in Millions		1 Months Ended		12 Months Ended
	Dec. 26, 2019	Jul. 31, 2019	Apr. 30, 2019	Dec. 31, 2020	Jan. 31, 2020
Fair Value Measurements
Contingent consideration				$ 8,960
DBOT
Fair Value Measurements
Contingent consideration				$ 649
Number of common stock issued		1.4	4.4	13.1
Tree Technologies
Fair Value Measurements
Contingent consideration				$ 8,311
Number of common stock issued	9.5
Level III
Fair Value Measurements
Contingent consideration					$ 8,960
Level III | DBOT
Fair Value Measurements
Contingent consideration					649
Level III | Tree Technologies
Fair Value Measurements
Contingent consideration					$ 8,311