Contingent Consideration - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measurements
Contingent consideration	$ 727	$ 867
DBOT
Fair Value Measurements
Contingent consideration	649	649
Tree Technologies
Fair Value Measurements
Contingent consideration	78	118
Solectrac
Fair Value Measurements
Contingent consideration	0	100
VIA Motors International, Inc.
Fair Value Measurements
Contingent consideration	0
Level 1
Fair Value Measurements
Contingent consideration	0	0
Level 1 | DBOT
Fair Value Measurements
Contingent consideration	0	0
Level 1 | Tree Technologies
Fair Value Measurements
Contingent consideration	0	0
Level 1 | Solectrac
Fair Value Measurements
Contingent consideration	0	0
Level 1 | VIA Motors International, Inc.
Fair Value Measurements
Contingent consideration	0
Level 2
Fair Value Measurements
Contingent consideration	0	0
Level 2 | DBOT
Fair Value Measurements
Contingent consideration	0	0
Level 2 | Tree Technologies
Fair Value Measurements
Contingent consideration	0	0
Level 2 | Solectrac
Fair Value Measurements
Contingent consideration	0	0
Level 2 | VIA Motors International, Inc.
Fair Value Measurements
Contingent consideration	0
Level 3
Fair Value Measurements
Contingent consideration	727	867
Level 3 | DBOT
Fair Value Measurements
Contingent consideration	649	649
Level 3 | Tree Technologies
Fair Value Measurements
Contingent consideration	78	118
Level 3 | Solectrac
Fair Value Measurements
Contingent consideration	0	$ 100
Level 3 | VIA Motors International, Inc.
Fair Value Measurements
Contingent consideration	$ 0