Nature of Business and Organization, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, ¥ in Thousands								12 Months Ended
	Mar. 01, 2024	Feb. 29, 2024 shares	Feb. 23, 2024 shares	Feb. 05, 2024 shares	Aug. 25, 2023 shares	Aug. 22, 2023 $ / shares shares	Aug. 16, 2023	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Feb. 04, 2024 shares	Dec. 31, 2023 CNY (¥)	Feb. 28, 2023 shares	Nov. 03, 2022 shares	Dec. 31, 2021 shares
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Insurance limits								$ 250,000			¥ 500
Revenue (less than for automotive leasing revenue)								$ 784,000	$ 0
Term of contract (in months)								36 months			36 months
Sales-type lease, term of contract								36 months			36 months
Customer deposits								$ 3,200,000	3,400,000
Deferred revenue								0	0
Impairment charges								0	0
Stock-based compensation expense								9,167,000	17,664,000
Accrued interest or penalties								$ 0	0
Number of operating segments | segment								1
Number of reportable segments | segment								1
Common stock, shares authorized (in shares) | shares					51,479,167	154,437,500						17,354,167	3,750,000	3,437,500
Common stock, shares authorized before effect of reverse stock split (in shares) | shares					12,355,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.0001
Research And Development Expense And Selling And Marketing Expense
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Co-creation fees								$ 400,000
Automobiles
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Revenue (less than for automotive leasing revenue)								800,000
Automobile Lease
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Revenue (less than for automotive leasing revenue)								100,000
Automobile Lease - Operating Leasing Program
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Revenue (less than for automotive leasing revenue)								100,000
Automobile Lease - Sales-Type Leasing Program
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Revenue (less than for automotive leasing revenue)								$ 100,000
Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stockholder's equity, stock split, conversion ratio						0.0125	0.125
Subsequent Event
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Common stock, shares authorized (in shares) | shares		463,312,500	463,312,500	1,389,937,500						154,437,500
Common stock, shares authorized before effect of reverse stock split (in shares) | shares			1,389,937,500
Subsequent Event | Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stockholder's equity, stock split, conversion ratio	0.333	0.333	0.333	0.333
Revision of Prior Period, Adjustment
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stock-based compensation expense									$ 1,800,000