Goodwill - Amortizing and Indefinite-lived Intangible Assets (Details) $ in Thousands			3 Months Ended				9 Months Ended	12 Months Ended
	Jan. 15, 2021 USD ($)	Jan. 01, 2021	Sep. 30, 2021 USD ($)	Dec. 31, 2019 area	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 11, 2021	Apr. 20, 2021	Mar. 31, 2021	Jan. 08, 2021	Jan. 15, 2020
Amortizing Intangible Assets
Gross Carrying Amount​			$ 78,371				$ 78,371	$ 31,378
Accumulated Amortization			(4,650)				(4,650)	(1,726)
Total			73,721				73,721	29,652
Total intangible assets
Gross Carrying Amount​			78,896				78,896	31,431
Net Balance			74,246				74,246	29,705
Grapevine Logic, Inc. ("Grapevine")
Total intangible assets
Percentage of ownership interest										100.00%
Grapevine Logic, Inc. ("Grapevine")
Total intangible assets
Impairment loss						$ 800
Equity method investment, ownership percentage						65.70%
DBOT
Total intangible assets
Finite-lived intangible assets acquired					$ 8,300
Equity method investment, ownership percentage					99.00%
Tree Technologies
Total intangible assets
Number of acres | area				250
Equity method investment, ownership percentage				51.00%
Timios
Total intangible assets
Percentage of ownership interest acquired												100.00%
Equity method investment, ownership percentage											100.00%
WAVE
Total intangible assets
Percentage of ownership interest acquired											100.00%		100.00%
Fair value of previously held interest	$ 32,377
Solectrac
Total intangible assets
Percentage of ownership interest acquired									78.60%
Percent of battery power									100.00%
Timios Title Plant
Indefinite lived intangible assets
Net Balance			500				500
Website name
Indefinite lived intangible assets
Net Balance			25				25	25
Patent
Indefinite lived intangible assets
Net Balance			$ 0				0	28
Influencer network
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)		2 years	0 years
Gross Carrying Amount​			$ 0				0	1,137
Accumulated Amortization			0				0	(462)
Total			$ 0				0	675
Customer contract
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)			0 years
Gross Carrying Amount​			$ 0				0	500
Accumulated Amortization			0				0	(389)
Total			0				$ 0	111
Continuing membership agreement
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							17 years 9 months 18 days
Gross Carrying Amount​			1,179				$ 1,179	1,179
Accumulated Amortization			(642)				(642)	(619)
Total			$ 537				537	560
Trade name
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)			0 years
Gross Carrying Amount​			$ 0				0	110
Accumulated Amortization			0				0	(17)
Total			$ 0				0	93
Technology platform
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)		1 year	0 years
Gross Carrying Amount​			$ 0				0	290
Accumulated Amortization			0				0	(97)
Total			0				$ 0	193
Land use rights
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							97 years 3 months 18 days
Gross Carrying Amount​			27,024				$ 27,024	28,162
Accumulated Amortization			(341)				(341)	(142)
Total			26,683				$ 26,683	28,020
Timios licenses
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							14 years 3 months 18 days
Gross Carrying Amount​			1,000				$ 1,000	0
Accumulated Amortization			(49)				(49)	0
Total			951				$ 951	0
Timios tradename
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							14 years 3 months 18 days
Gross Carrying Amount​			7,108				$ 7,108	0
Accumulated Amortization			(378)				(378)	0
Total			6,730				$ 6,730	0
Timos lender relationships
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							6 years 3 months 18 days
Gross Carrying Amount​			1,539				$ 1,539	0
Accumulated Amortization			(1,539)				(1,539)	0
Total			0				$ 0	0
Timios software
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							2 years 9 months 18 days
Gross Carrying Amount​			452				$ 452	0
Accumulated Amortization			(38)				(38)	0
Total			414				$ 414	0
WAVE patents
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							13 years 3 months 18 days
Gross Carrying Amount​			13,000				$ 13,000	0
Accumulated Amortization			(656)				(656)	0
Total			12,344				$ 12,344	0
WAVE tradename
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							14 years 3 months 18 days
Gross Carrying Amount​			12,630				$ 12,630	0
Accumulated Amortization			(595)				(595)	0
Total			12,035				$ 12,035	0
Software - Solectrac
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							1 year 9 months 18 days
Gross Carrying Amount​			38				$ 38	0
Accumulated Amortization			(5)				(5)	0
Total			33				$ 33	0
Solectrac - Brand
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							9 years 8 months 12 days
Gross Carrying Amount​			4,570				$ 4,570	0
Accumulated Amortization			(138)				(138)	0
Total			4,432				$ 4,432	0
Solectrac - Technology
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							9 years 8 months 12 days
Gross Carrying Amount​			2,450				$ 2,450	0
Accumulated Amortization			(74)				(74)	0
Total			2,376				$ 2,376	0
US Hybrid - Brand
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							6 years 8 months 12 days
Gross Carrying Amount​			1,740				$ 1,740	0
Accumulated Amortization			(75)				(75)	0
Total			1,665				$ 1,665	0
US Hybrid - Technology
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							12 years 8 months 12 days
Gross Carrying Amount​			5,110				$ 5,110	0
Accumulated Amortization			(119)				(119)	0
Total			4,991				$ 4,991	0
US Hybrid - Non-compete
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							4 years 8 months 12 days
Gross Carrying Amount​			520				$ 520	0
Accumulated Amortization			0				0	0
Total			520				$ 520	0
Software
Amortizing Intangible Assets
Weighted Average Remaining Useful Life (in years)							4 years 9 months 18 days
Gross Carrying Amount​			11				$ 11	0
Accumulated Amortization			(1)				(1)	0
Total			$ 10				$ 10	0
Customer Lists
Total intangible assets
Impairment loss								7,100
Fair value of previously held interest								$ 600