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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Date the credit facility terminates, in YYYY-MM-DD format.

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Date the credit facility first became available, in YYYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Description of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands		3 Months Ended						9 Months Ended
	Nov. 28, 2022 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) Subsidiary	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Basis Of Presentation [Line Items]
Number of Subsidiaries \| Subsidiary								3
Net loss incurred		$ 13,073	$ 15,423	$ 16,796	$ 29,595	$ 24,050	$ 19,484	$ 45,292	$ 73,129
Cash used in operations								39,833	$ 70,319
Cash for capital expenditures								147,700
Unrestricted cash and cash equivalents		94,643						94,643		$ 281,335
General Motors Holdings Llc [Member] \| Loan Agreement [Member]
Basis Of Presentation [Line Items]
Aggregate principal amount	$ 100,000	$ 500,000						$ 500,000
Senior secured term loan, Draw beginning date	Jan. 01, 2023
Senior secured term loan, Draw Endining date	Sep. 30, 2023
Percentage cost								70.00%