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Contingent Consideration - Summary of Financial Instruments (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jan. 15, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
DBOT        
Fair Value Measurements        
Contingent consideration   $ 649 $ 649  
Number of common stock issued (in shares)     0 11,300,000
Tree Technologies        
Fair Value Measurements        
Contingent consideration   6,404 $ 6,404  
WAVE        
Fair Value Measurements        
Contingent consideration   $ 7,657 $ 7,657  
Number of common stock issued (in shares) 12,600,000 2,400,000    
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 III | DBOT        
Fair Value Measurements        
Contingent consideration   649 $ 649  
Level III | Tree Technologies        
Fair Value Measurements        
Contingent consideration   6,404 6,404  
Level III | WAVE        
Fair Value Measurements        
Contingent consideration   7,658 7,658  
Level III | Solectrac        
Fair Value Measurements        
Contingent consideration   $ 1,639 $ 1,639