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Financial Statement Schedule I - Condensed Financial Information of Parent Company Statements of Cash Flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Net cash (used in)/generated from operating activities | ¥ 9,144 | $ 1,329 | ¥ (373,251) | ¥ (188,641)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Purchase of short-term investments | (1,244,636) | (180,455) | (1,833,650) | (2,195,567)
Purchase of long-term investments | 13,107 | 1,900 | 638 | 25,400
Proceeds from maturity of short-term investments | 1,357,856 | 196,871 | 2,166,910 | 1,895,897
Loan to employees |  |  | (2,504) |
Repayment of loan to employees | 123 | 18 | 101 | 903
Net cash (used in)/generated from investing activities | 96,182 | 13,947 | 342,681 | (349,306)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Net cash used in financing activities | (67,911) | (9,845) | (38,904) | (59,079)
Effect of exchange rate changes | 43,266 | 6,266 | (14,513) | (44,490)
Net (decrease)/increase in cash, cash equivalents and restricted cash | 80,681 | 11,697 | (83,987) | (641,516)
Cash, cash equivalents and restricted cash at beginning of the year | 676,723 | 98,116 | 760,710 | 1,402,226
Cash, cash equivalents and restricted cash at end of the year | 757,404 | 109,813 | 676,723 | 760,710
Parent Company |  |  |  |
Net cash (used in)/generated from operating activities | 53,792 | (7,799) | (37,609) | (427,279)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Purchase of short-term investments |  |  |  | (120,107)
Purchase of long-term investments | (13,013) | (1,887) |  |
Proceeds from maturity of short-term investments | 0 |  |  | 120,107
Amounts due from subsidiaries |  |  | (69,529) |
Loan to employees |  |  | (2,204) |
Repayment of loan to employees |  |  |  | 563
Net cash (used in)/generated from investing activities | 34,125 | (4,947) | (71,733) | 563
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | (6,742) | (977) | (4,866) | (26,579)
Payment for cash dividend | (32,562) | (4,721) |  |
Net cash used in financing activities | (29,257) | (4,241) | (4,866) | (26,579)
Effect of exchange rate changes | 45,245 | 6,560 | (13,365) | (44,317)
Net (decrease)/increase in cash, cash equivalents and restricted cash | (3,679) | (533) | (127,573) | (497,612)
Cash, cash equivalents and restricted cash at beginning of the year | 499,863 | 72,473 | 627,436 | 1,125,048
Cash, cash equivalents and restricted cash at end of the year | ¥ 496,184 | $ 71,940 | ¥ 499,863 | ¥ 627,436

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