Reportable Segments and Geographic Information - Information By Industry Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Assets	$ 266,147	$ 351,805	$ 61,952
Goodwill	8,327	8,327	8,327
Depreciation and amortization	5,832	4,401	4,718
Capital expenditures	13,462	14,081	9,951
Electric Motorcycles
Segment Reporting Information
Assets	232,981	323,108	38,762
Goodwill	7,668	7,668	7,668
Depreciation and amortization	5,312	3,882	4,220
Capital expenditures	13,453	14,081	9,792
STACYC
Segment Reporting Information
Assets	33,166	28,697	23,190
Goodwill	659	659	659
Depreciation and amortization	520	519	498
Capital expenditures	$ 9	$ 0	$ 159