Commitment and Contingencies (Details) reservation in Thousands, $ in Thousands		1 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 14, 2022	Oct. 31, 2023 USD ($)	Apr. 30, 2022 claim	Mar. 31, 2022 claim	Jul. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2021 reservation
Loss Contingencies [Line Items]
Accrued legal contingencies						$ 21,819		$ 21,819				$ 18,940
Loss contingency, new claims filed | claim			2	2
Number of reservations received for vehicles | reservation													14
Number of unpaid indications of interest | reservation													14
Total accrued expenses and other current liabilities						68,446		68,446				65,709
Palantir
Loss Contingencies [Line Items]
Amount committed					$ 47,000
Hosting arrangement term					6 years
Hosting arrangement, amount paid										$ 5,300
Accounts payable						12,300		12,300				2,500
Total accrued expenses and other current liabilities												$ 3,000
Hosting arrangement, service contract expense						$ 2,000	$ 2,000	$ 5,900	$ 5,900
Chief Executive Officer
Loss Contingencies [Line Items]
Annual base salary reduction	25.00%
Chief Product And User Ecosystem Officer
Loss Contingencies [Line Items]
Annual base salary reduction	25.00%
Palantir
Loss Contingencies [Line Items]
Estimate of possible loss											$ 41,500
Subsequent Event
Loss Contingencies [Line Items]
Legal claims were settled in cash		$ 7,500