BALANCE SHEETS COMPONENTS - Construction in Progress (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Machinery and equipment
Property, plant and equipment, gross	$ 1,015,636	$ 738,045
Construction in progress
Machinery and equipment
Property, plant and equipment, gross	208,331	636,851
Tooling
Machinery and equipment
Property, plant and equipment, gross	106,402	203,241
Construction of Arizona plant
Machinery and equipment
Property, plant and equipment, gross	10,806	171,532
Leasehold improvements
Machinery and equipment
Property, plant and equipment, gross	67,965	50,790
Machinery and equipment
Machinery and equipment
Property, plant and equipment, gross	$ 23,158	$ 211,288

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant