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Prepaid expenses and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Prepaid expenses and other current assets      
Costs to obtain contracts with customers ¥ 199,873   ¥ 168,571
Prepaid taxes 25,600   13,860
Prepaid advertising expenses 19,977   18,014
Prepaid rental and other deposits 14,514   13,601
Interest receivables 10,231   2,430
Prepaid fees to third-party payment channels 8,980   8,250
Prepaid professional service fees 3,738   3,704
Advances to employees 1,723   1,658
Prepaid Directors & Officers insurance 852   782
Students tuition payments in transit 603   1,291
Prepaid PayPal to pay teacher salary costs 561   4,077
Prepaid student acquisition fees 29   2,093
Others 15,376   11,884
Total ¥ 302,057 $ 46,292 ¥ 250,215