Summary of Significant Accounting Policies - Summary of Operating Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (2,756)	$ (2,491)	$ (18,168)	$ (7,970)
Discontinued Operations, Disposed of by Sale | Timios
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	5,456	24,817	10,366	47,978
Cost of revenue	4,377	22,839	9,736	45,116
Gross profit	1,079	1,978	630	2,862
Selling and administrative expenses	3,900	4,967	8,035	11,028
Depreciation and amortization	2	509	274	1,019
Asset impairments	116	251	9,442	251
Other operating costs	10	42	10	42
Operating loss	(2,949)	(3,791)	(17,131)	(9,478)
Non-operating income (expense)	141	1,277	(1,158)	1,322
Income tax benefit	52	23	121	186
Loss from discontinued operations, net of tax	(2,756)	(2,491)	(18,168)	(7,970)
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	8,138	9,345	13,664	11,559
Cost of revenue	7,469	9,845	13,212	12,926
Gross profit	669	(500)	452	(1,367)
Selling and administrative expenses	9,500	12,160	19,060	19,075
Depreciation and amortization	1,363	1,483	2,712	1,979
Asset impairments	148	321	148	333
Other operating costs	815	679	1,558	1,500
Operating loss	$ (11,157)	$ (15,143)	$ (23,026)	$ (24,254)