Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Oct. 22, 2020	Aug. 03, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options outstanding to purchase shares of common stock (in shares)		268,323	211,764		211,764
Share-based payments expense			$ 0.7	$ 2.2	$ 6.5	$ 7.4
Unrecognized compensation expense related to non-vested share options			$ 0.9		$ 0.9
Weighted average period for recognition related to non-vested stock options (in years)					1 year 2 months 1 day
Total intrinsic value of shares exercised					$ 0.0	0.0
Total fair value of vested shares					$ 4.1	6.7
2010 Stock Incentive Plan ("the Plan")
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)							500,000	300,000
Number of options available for issuance (in shares)			400,000		400,000
Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options outstanding to purchase shares of common stock (in shares)			200,000		200,000
Cash received from options exercised					$ 0.0	$ 0.0
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Outstanding shares to purchase shares of common stock (in shares)			0		0
Adjusted restricted shares granted (in shares)	28,500
Unrecognized compensation cost related to unvested restricted shares			$ 0.8		$ 0.8
Restricted Stock Units (RSUs) | VIA Motors International, Inc.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Restricted shares granted (in shares)	1,500,000
Amount of grant date fair value of the restricted shares	$ 0.7
Restricted Stock Units (RSUs) | 2010 Stock Incentive Plan ("the Plan")
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Restricted shares granted (in shares)		100,000			100,000
Vesting period (in years)		2 years			2 years
Amount of grant date fair value of the restricted shares		$ 1.6			$ 1.5