Contingent Consideration - Summary of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value Measurements
Contingent consideration	$ 5,112						$ 5,112		$ 8,960
Common Stock
Fair Value Measurements
Common stock issuance for acquisition (in shares)	2,011,617	6,733,497	10,181,299	1,613,207	459,180	10,883,668
DBOT
Fair Value Measurements
Contingent consideration	$ 649						$ 649		649
DBOT | Common Stock
Fair Value Measurements
Common stock issuance for acquisition (in shares)							0	11,300,000
Tree Technologies
Fair Value Measurements
Contingent consideration	1,305						$ 1,305		8,311
Tree Technologies | Common Stock
Fair Value Measurements
Common stock issuance for acquisition (in shares)				2,000,000
WAVE
Fair Value Measurements
Contingent consideration	1,519						$ 1,519
Percent of consents to be received							100.00%
Solectrac
Fair Value Measurements
Contingent consideration	1,639						$ 1,639
Contingent consideration period (in years)							3 years
Level I
Fair Value Measurements
Contingent consideration	0						$ 0		0
Level I | DBOT
Fair Value Measurements
Contingent consideration	0						0		0
Level I | Tree Technologies
Fair Value Measurements
Contingent consideration	0						0		0
Level I | WAVE
Fair Value Measurements
Contingent consideration	0						0
Level I | Solectrac
Fair Value Measurements
Contingent consideration	0						0
Level II
Fair Value Measurements
Contingent consideration	0						0		0
Level II | DBOT
Fair Value Measurements
Contingent consideration	0						0		0
Level II | Tree Technologies
Fair Value Measurements
Contingent consideration	0						0		0
Level II | WAVE
Fair Value Measurements
Contingent consideration	0						0
Level II | Solectrac
Fair Value Measurements
Contingent consideration	0						0
Level III
Fair Value Measurements
Contingent consideration	5,112						5,112		8,960
Level III | DBOT
Fair Value Measurements
Contingent consideration	649						649		649
Level III | Tree Technologies
Fair Value Measurements
Contingent consideration	1,305						1,305		$ 8,311
Level III | WAVE
Fair Value Measurements
Contingent consideration	1,519						1,519
Level III | Solectrac
Fair Value Measurements
Contingent consideration	$ 1,639						$ 1,639