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Parent only financial information - Condensed statements of cash flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash provided by (used in) operating activities | $ 17,025 | ¥ 118,511 | ¥ 129,478 | ¥ (674,426)
Cash flows from investing activities: |  |  |  |
Investment in short-term investments | (65,524) | (456,167) | (1,267,483) | (756,000)
Net cash used in investing activities | (21,806) | (151,809) | (349,859) | 212,127
Cash flows from financing activities: |  |  |  |
Proceeds from initial public offering, net of offering cost | 71,596 | 498,436 |  |
Net cash provided by financing activities | 85,241 | 593,436 | (268,100) | 663,100
Effect of exchange rate changes on cash and cash equivalents | (2,944) | (20,484) | 19,076 | (40,020)
Net (decrease) increase in cash, cash equivalents and restricted cash | 77,516 | 539,654 | (469,405) | 160,781
Cash, cash equivalents and restricted cash at the beginning of the year | 114,082 | 794,218 | 1,263,623 | 1,102,842
Cash, cash equivalents and restricted cash at the end of the year | $ 191,598 | 1,333,872 | 794,218 | 1,263,623
Reportable Legal Entities | Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net cash provided by (used in) operating activities |  | (883) | 25 | (2,479)
Cash flows from investing activities: |  |  |  |
Investments in and amounts due from subsidiaries, the VIE and VIE's subsidiaries |  | (64,295) |  | (660,531)
Investment in short-term investments |  | (380,901) |  |
Proceeds from redemption of short-term investments |  | 380,901 |  |
Net cash used in investing activities |  | (64,295) |  | (660,531)
Cash flows from financing activities: |  |  |  |
Proceeds from initial public offering, net of offering cost |  | 498,436 |  |
Net cash provided by financing activities |  | 498,436 |  |
Effect of exchange rate changes on cash and cash equivalents |  | (2,265) | 1 | (18,742)
Net (decrease) increase in cash, cash equivalents and restricted cash |  | 430,993 | 26 | (681,752)
Cash, cash equivalents and restricted cash at the beginning of the year |  | 36 | 10 | 681,762
Cash, cash equivalents and restricted cash at the end of the year |  | ¥ 431,029 | ¥ 36 | ¥ 10

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