BALANCE SHEETS COMPONENTS - Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Engineering, design, and testing accrual	$ 31,271	$ 42,518
Construction in progress	21,638	43,115
Retail leasehold improvements accrual	15,203	6,114
Other professional services accrual	6,029	9,083
Tooling liability	12,338	15,243
Payroll tax liability	32,728	0
Series B convertible preferred stock repurchase liability	0	3,000
Short-term insurance financing note	24,674	980
Operating lease liabilities, current portion	14,611	0
Transaction cost liability	40,981	0
Other liabilities	28,804	31,700
Other current liabilities	$ 228,277	$ 151,753