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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