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Condensed Financial Information of the Parent Company - Condensed Statements of Cash Flows (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) / provided by financing activities	¥ (17,476)	$ (2,533)	¥ (76,650)	¥ 75,810
Net cash used in investing activities	26,853	3,893	26,442	(144,415)
Net cash provided by/ (used in) financing activities	(148,040)	(21,464)	(54,520)	315
Effect of exchange rate changes	341	49	3,080	(7,054)
Net (decrease)/ increase in cash and cash equivalents and restricted cash	(138,322)	(20,055)	(101,648)	(75,344)
Cash and cash equivalents and restricted cash at the beginning of year	254,582	36,911	356,230	431,574
Cash and cash equivalents and restricted cash at the end of year	116,260	16,856	254,582	356,230
Parent Company
Condensed Cash Flow Statements Captions [Line Items]
Net cash (used in) / provided by financing activities	195,530	28,349	(24,383)	(17,412)
Net cash used in investing activities	(2,690)	(390)	(4,859)	(6,525)
Net cash provided by/ (used in) financing activities	(153,040)	(22,189)	(54,520)	5,257
Effect of exchange rate changes	(18,651)	(2,704)	4,361	(3,686)
Net (decrease)/ increase in cash and cash equivalents and restricted cash	21,149	3,066	(79,401)	(22,366)
Cash and cash equivalents and restricted cash at the beginning of year	12,722	1,845	92,123	114,489
Cash and cash equivalents and restricted cash at the end of year	¥ 33,871	$ 4,911	¥ 12,722	¥ 92,123

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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