Nature of Business and Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, ¥ in Thousands								12 Months Ended
	Aug. 04, 2024 $ / shares shares	Aug. 01, 2024	Feb. 29, 2024	Feb. 23, 2024 $ / shares shares	Feb. 05, 2024 shares	Aug. 22, 2023 shares	Aug. 16, 2023	Dec. 31, 2024 USD ($) segment shares	Dec. 31, 2023 USD ($)	Dec. 31, 2024 CNY (¥) shares	Aug. 31, 2024 shares	Jul. 31, 2024 shares	Feb. 04, 2024 shares	Aug. 25, 2023 shares	Feb. 28, 2023 shares
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of operating segments | segment								1
Insurance limits								$ 250,000		¥ 500
Stockholder's equity, stock split, conversion ratio	0.025			0.333		0.0125
Common stock, shares authorized (in shares) | shares	104,245,313			11,582,813	34,748,438	3,860,938		104,245,313		104,245,313	104,245,313	104,245,313	3,860,938	1,286,980	433,855
Common stock, shares authorized before effect of reverse stock split (in shares) | shares				34,748,438		308,875,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001			$ 0.0001
Number of reportable segments | segment								1
Other								$ 963,000	$ 1,075,000
Accounts payable								56,754,000	62,391,000
Impairment charges								$ 0	0
Term of contract (in months)								36 months		36 months
Sales-type lease, term of contract								36 months		36 months
Customer deposits								$ 3,027,000	3,246,000
Deferred revenue								0	0
Stock-based compensation expense								8,382,000	9,167,000
Revenue From Contract With Customer, Excluding Assessed Tax
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Co-creation fees								300,000	400,000
Marketing Expense
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Co-creation fees								600,000	400,000
Nonrelated Party
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Gain (loss) extinguishments of debt								(161,725,000)	(217,019,000)
Accounts payable								45,677,000	55,109,000
Related Party
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Gain (loss) extinguishments of debt								(14,295,000)	(20,045,000)
Accounts payable								11,077,000	7,282,000
Revision of Prior Period, Reclassification, Adjustment
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Gain (loss) extinguishments of debt								(237,100,000)
Other								400,000	1,100,000
Revision of Prior Period, Reclassification, Adjustment | Nonrelated Party
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Gain (loss) extinguishments of debt									(217,000,000.0)
Accounts payable								$ 7,300,000
Revision of Prior Period, Reclassification, Adjustment | Related Party
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Gain (loss) extinguishments of debt									(20,000,000.0)
Revision of Prior Period, Adjustment
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stock-based compensation expense									1,800,000
Previously Reported
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Other									$ 700,000
Common Stock
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Stockholder's equity, stock split, conversion ratio		0.025	0.333		0.333	0.0125	0.125