Summary of Significant Accounting Policies - Schedule of Operating Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (2,368)	$ (5,531)	$ (24,206)	$ (20,237)
Discontinued Operations, Disposed of by Sale | Timios
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	1,820	16,057	15,043	64,928
Cost of revenue	2,010	16,059	13,200	64,160
Gross profit	(190)	(2)	1,843	768
Selling and administrative expenses	3,831	6,686	15,918	21,951
Depreciation and amortization	35	619	433	1,827
Asset impairments	1,133	80	10,575	331
Other operating costs	20	21	40	167
Operating loss	(5,209)	(7,408)	(25,123)	(23,508)
Non-operating income (expense)	2,841	1,789	796	3,088
Income tax benefit	0	88	121	183
Loss from discontinued operations, net of tax	(2,368)	(5,531)	(24,206)	(20,237)
Discontinued Operations, Held-for-sale | Energica, Solectrac, Wave Technologies and US Hybrid
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	637	8,172	11,477	18,887
Cost of revenue	2,110	8,870	13,893	18,842
Gross profit	(1,473)	(698)	(2,416)	45
Selling and administrative expenses	5,372	9,766	21,488	25,836
Depreciation and amortization	1,380	1,428	4,045	3,389
Asset impairments	0	(321)	148	12
Other operating costs	531	830	2,089	2,250
Operating loss	$ (8,756)	$ (12,401)	$ (30,186)	$ (31,442)