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Organization and principal activities - Income Statement and Cash flow information (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Variable Interest Entity [Line Items] |  |  |  |
Total revenue | $ 517,027 | ¥ 3,599,436 | ¥ 2,282,216 | ¥ 1,798,521
Net income (loss) | (73,311) | (510,387) | 104,026 | 649
Net cash provided by (used in) operating activities | 17,025 | 118,511 | 129,478 | (674,426)
Net cash used in investing activities | (21,806) | (151,809) | (349,859) | 212,127
Net cash provided by financing activities | 85,241 | 593,436 | (268,100) | 663,100
Net increase (decrease) in cash and 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
VIE |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total revenue |  | 3,599,436 | 2,282,216 | 1,798,521
Net income (loss) |  | (520,230) | 107,511 | 6,237
Net cash provided by (used in) operating activities |  | 103,298 | 116,937 | (663,005)
Net cash used in investing activities |  | (206,192) | (303,375) | 214,872
Net cash provided by financing activities |  | 329,000 | 31,900 | 663,100
Net increase (decrease) in cash and cash equivalents and restricted cash |  | 226,106 | (154,538) | 214,967
Cash, cash equivalents and restricted cash at the beginning of the year |  | 420,183 | 574,721 | 359,754
Cash, cash equivalents and restricted cash at the end of the year |  | ¥ 646,289 | ¥ 420,183 | ¥ 574,721

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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