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Prepaid expenses and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Prepaid expenses and other current assets      
Costs to obtain contracts with customers   ¥ 168,571 ¥ 137,666
Prepaid advertising expenses   18,014 29,735
Prepaid taxes   13,860 27,414
Prepaid rental and other deposits   13,601 13,454
Prepaid fees to third-party payment channels   8,250 6,490
Prepaid student acquisition fees   2,093 3,281
Prepaid professional service fees   3,704 2,719
Advances to employees   1,658 2,439
Interest receivables   2,430 1,893
Prepaid Directors & Officers insurance   782 844
Prepayment for purchase of fix assets   707 1,281
Prepaid PayPal to pay teacher salary costs   4,077 1,291
Students tuition payments in transit   1,291 1,322
Others   11,177 12,670
Total $ 35,941 ¥ 250,215 ¥ 242,499