Deposits and Other Current Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Deposits And Other Current Assets [Line Items]
Deposits for research and development, prototype parts, and other, additions			$ 35,796
Deposits for research and development, prototype parts, and other, write off			367
Deposits for “Future Work”	$ 8,380		8,380		$ 0
Received tooling, machinery and equipment	0		0		0
Prepaid expenses	11,489		11,489		$ 762
Palantir
Deposits And Other Current Assets [Line Items]
Hosting arrangement, amount paid	3,000
Prepaid expenses	2,073		2,073
Amortization expense related to the Palantir hosting arrangement and other prepaid software subscriptions	$ 1,466	$ 1,739	$ 9	$ 439