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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary of Estimated Useful Lives and Residual Value of Property and Equipment

Plant and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:

Category		Estimated useful life		Residual value
Mold and tooling		2-5 years			0	%
Office equipment		5 years			5	%
Machinery and electronic equipment		3-10 years			5	%
Transportation equipment		4 years			5	%
Leasehold improvements		Shorter of lease term or the estimated useful lives of the assets			0	%

Summary of Amortization of Intangible Assets with Finite Lives

Amortization of intangible assets with finite lives are computed using the straight-line method over the estimated useful lives as below:

Category		Estimated useful life
Software		3-5 years
Patents and trademarks		5 years

Summary of Revenue by Customer Incorporation Location

The following table presents revenue by customer incorporation location for the years ended December 31, 2020, 2021 and 2022, respectively:

		For the year ended December 31,
		2020								2021								2022
		RMB				%				RMB				%				RMB				US$				%
PRC			164,153				91	%			49,683				87	%			33,975				4,926				77	%
West Asia			2,124				1	%			—				—				4,630				671				10	%
Europe			2,388				1	%			2,199				4	%			2,638				382				6	%
East Asia			4,550				3	%			4,404				8	%			798				116				2	%
Other			6,878				4	%			521				1	%			2,276				330				5	%
Total net revenues			180,093				100	%			56,807				100	%			44,317				6,425				100	%

Summary of Operating Lease Liabilities

A maturity analysis of the Company’s operating lease liabilities and reconciliation of the undiscounted cash flows to the operating lease liabilities recognized on the consolidated balance sheet was as below:

		Office and production facilities rental
		RMB				US$
2023			5,632				817
2024			4,290				622
2025			4,982				721
2026			6,448				935
2027			6,817				988
2028 and thereafter			88,136				12,779
Minimum lease payments			116,305				16,862
Less: imputed interest			(40,872	)			(5,926	)
Present value of lease liabilities			75,433				10,936
Less: Current portion			(5,520	)			(800	)
Non-current portion of lease liabilities			69,913				10,136

Summary of Future Minimum Lease Payments

As of December 31, 2021, future minimum lease payments under non-cancellable operating leases with initial terms in excess of one year consisted of the following:

		Office and production facilities rental
		RMB
2022			11,530
2023			5,926
2024			791
2025			1,252
2026			2,635
2027 and thereafter			4,612
Total			26,746

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Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

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Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.

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