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Additional Information - Condensed Financial Statements of the Parent Company - Condensed statements of cash flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Condensed statements of cash flows |  |  |  |
Net cash used in operating activities | $ (13,618) | ¥ (88,854) | ¥ (161,806) | ¥ (53,338)
Cash flows from investing activities: |  |  |  |
Cash received from maturity of time deposits | 25,470 | 166,192 |  |
Net cash (used in)/generated from investing activities | 5,777 | 37,698 | (187,548) | (20,746)
Cash flows from financing activities: |  |  |  |
Cash payments for repurchase of shares |  |  | 13,749 |
Proceeds from issuance of Series D-1 convertible redeemable preferred shares |  |  |  | 151,118
Payment of issuance cost for Series D-1 convertible redeemable preferred shares |  |  |  | (307)
Proceeds from issuance of Series D-2 convertible redeemable preferred shares |  |  |  | 359,834
Payment of issuance cost for Series D-2 convertible redeemable preferred share |  |  |  | (1,267)
Proceeds of initial public offering, net of issuance costs |  |  |  | 103,372
Net cash generated from/(used in) financing activities | (10) | (63) | (37,245) | 562,126
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (687) | (4,485) | 3,490 | 12,713
Net increase/(decrease) in cash, cash equivalents and restricted cash | (8,538) | (55,704) | (383,109) | 500,755
Cash, cash equivalents and restricted cash at beginning of the year | 29,954 | 195,449 | 578,558 | 77,803
Cash, cash equivalents and restricted cash at end of the year | 21,416 | 139,745 | 195,449 | 578,558
Parent Company [Member] | Reportable Legal Entities Member |  |  |  |
Condensed statements of cash flows |  |  |  |
Net cash used in operating activities | (2,087) | (13,622) | (3,086) | (9,640)
Cash flows from investing activities: |  |  |  |
Cash paid for investments in VIE and VIE's subsidiaries | (10,119) | (66,027) | (151,006) | (201,744)
Cash payment of time deposits | (21,611) | (141,016) | (69,762) |
Cash payment of bridge loan |  |  | (99,148) |
Cash received from maturity of time deposits | 25,469 | 166,192 |  |
Net cash (used in)/generated from investing activities | (6,261) | (40,851) | (319,916) | (201,744)
Cash flows from financing activities: |  |  |  |
Cash payments for repurchase of restricted shares from employees |  |  | (26,228) |
Cash payments for repurchase of shares |  |  | (13,749) |
Cash received from acquisition | 204 | 1,330 |  |
Proceeds from issuance of Series D-1 convertible redeemable preferred shares |  |  |  | 151,118
Payment of issuance cost for Series D-1 convertible redeemable preferred shares |  |  |  | (307)
Proceeds from issuance of Series D-2 convertible redeemable preferred shares |  |  |  | 359,834
Payment of issuance cost for Series D-2 convertible redeemable preferred share |  |  |  | (1,267)
Proceeds of initial public offering, net of issuance costs |  |  |  | 103,372
Cash received from the depositary bank |  |  | 2,732 |
Net cash generated from/(used in) financing activities | 204 | 1,330 | (37,245) | 612,750
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (361) | (2,358) | 3,313 | 12,134
Net increase/(decrease) in cash, cash equivalents and restricted cash | (8,505) | (55,501) | (356,934) | 413,500
Cash, cash equivalents and restricted cash at beginning of the year |  | 102,002 | 458,936 |
Cash, cash equivalents and restricted cash at end of the year | $ 7,127 | ¥ 46,501 | ¥ 102,002 | ¥ 458,936

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