SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents, and restricted cash to amounts shown in the statements of cash flows (in thousands):

	December 31,
	2025		2024
Cash and cash equivalents	$	997,827	$	1,606,865
Restricted cash included in other current assets	19,860		14
Restricted cash included in other noncurrent assets	23,226		173
Total cash, cash equivalents, and restricted cash	$	1,040,913	$	1,607,052

Schedule of Restricted Cash

The following table provides a reconciliation of cash, cash equivalents, and restricted cash to amounts shown in the statements of cash flows (in thousands):

	December 31,
	2025		2024
Cash and cash equivalents	$	997,827	$	1,606,865
Restricted cash included in other current assets	19,860		14
Restricted cash included in other noncurrent assets	23,226		173
Total cash, cash equivalents, and restricted cash	$	1,040,913	$	1,607,052

Schedule of Property, Plant and Equipment, Net

The Company generally uses the following estimated useful lives for each asset category:

Asset Category	Life (years)
Machinery, tooling and vehicles	3 - 15
Computer equipment and software	3
Furniture and fixtures	5
Finance leases	Shorter of the lease term or the estimated useful lives of the assets
Building and improvements	5 - 40
Leasehold improvements	Shorter of remaining lease term or the estimated useful lives of the assets

Property, plant and equipment, net as of December 31, 2025 and 2024 was as follows (in thousands):

	December 31, 2025		December 31, 2024
Land and land improvements	$	70,967	$	70,967
Building and improvements(1)	1,099,186		1,075,349
Machinery, tooling and vehicles(2)(3)	2,363,263		1,720,517
Computer equipment and software	140,419		105,012
Leasehold improvements	304,609		268,091
Furniture and fixtures	57,921		51,238
Finance leases	193,137		86,852
Construction in progress	970,960		672,534
Total Property, plant and equipment	5,200,462		4,050,560
Less accumulated depreciation and amortization	(1,222,330)		(787,948)
Property, plant and equipment, net	$	3,978,132	$	3,262,612

(1) As of December 31, 2025 and 2024, $127.5 million of capital expenditure support received from MISA was primarily recorded as a deduction to the AMP-2 building balance. See Note 2 “Summary of Significant Accounting Policies” and Note 16 “Related Party Transactions” for more information.

(2) Included $47.2 million and $39.5 million of service loaner vehicles as of December 31, 2025 and 2024, respectively.

(3) Included $33.7 million and $34.7 million of operating lease vehicles sold to rental companies as of December 31, 2025 and 2024, respectively.

Construction in progress consisted of the following (in thousands):

	December 31, 2025		December 31, 2024
Machinery and tooling	$	418,426	$	561,858
Construction of AMP-1 and AMP-2(1)	512,502		78,254
Leasehold improvements and other	40,032		32,422
Total construction in progress	$	970,960	$	672,534

(1) As of December 31, 2025 and 2024, $67.3 million of capital expenditure support received from MISA was recorded primarily as a deduction to the AMP-2 facility construction in progress balance. See Note 2 “Summary of Significant Accounting Policies” and Note 16 “Related Party Transactions” for more information.