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Long-term investments (Details) $ in Thousands, ¥ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2024 CNY (¥)
Long-term investments
Long-term investments	$ 61,876				$ 64,332
Consideration paid	1,112
Investments in limited partnerships
Long-term investments
Long-term investments	35,762				38,710
Hubei Qingyan Venture Capital Fund L.P.
Long-term investments
Long-term investments	11,813				14,294
Chongqing Qingyan Venture Capital Fund L.P.
Long-term investments
Long-term investments	12,410				12,426
Suzhou Qingshan Zhiyuan Venture Capital Fund L.P.
Long-term investments
Long-term investments	7,289				7,300
Suzhou Mingzhi Intelligent Manufacturing Industry Investment Fund L.P.
Long-term investments
Long-term investments	2,993				3,036
Suzhou Qingyan Venture Capital Fund L.P.
Long-term investments
Long-term investments	1,257				1,654
Investments in corporations
Long-term investments
Long-term investments	26,114				25,622
Sentient AB
Long-term investments
Long-term investments	18,658				19,224
Bebest (Shanghai) Automotive Electronics Co., Ltd.
Long-term investments
Long-term investments	2,794				2,782
Shanghai IAT International Automotive Technology Co., Ltd.
Long-term investments
Long-term investments	$ 1,272				1,316
Equity method investment, ownership percentage (as a percent)	25.00%
Consideration paid	$ 1,400	¥ 10.0
Jingzhou Jinyu Hotel Management Co., Ltd.
Long-term investments
Long-term investments	2,062				974
Hubei Henglongtianyu Pipe system Co., Ltd.
Long-term investments
Long-term investments	632				689
Jiangsu Intelligent Connected Vehicle Innovation Center Co., Ltd.
Long-term investments
Long-term investments	$ 696				$ 637
Hubei Venture Fund
Long-term investments
Equity method investment, ownership percentage (as a percent)	28.50%
Equity method investment	$ 2,200
Net equity earnings from investment	200
Jingzhou Jinyu
Long-term investments
Equity method investment, ownership percentage (as a percent)						14.50%	14.50%
Net equity earnings from investment						$ 2,100	¥ 15.0
Consideration paid	$ 1,100	¥ 8.0	$ 1,000	¥ 7.0