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Prepayments and other assets (Details) - Schedule of prepayments and other assets - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Prepayments and other current assets    
Receivables from third-party payment channels [1] ¥ 17,983 ¥ 17,420
Cash advanced to employees 517 275
Prepaid advertising and marketing fees 1,056 8,376
Prepaid rental and property management fees 3,109 12,528
Prepayment for purchase of office supplies 534 2,460
Books and other related educational materials [2] 9,254 10,131
Prepayment for acquisition of subsidiaries 3,085 4,379
Prepaid taxes 4,837 3,704
Others 10,283 5,517
Total 50,658 64,790
Long-term prepayments and other non-current assets    
Prepayment for leasehold improvement 50 10,923
Long-term rental deposits 40,704 51,512
Total ¥ 40,754 ¥ 62,435
[1] The balances represent the course fee for the courses due from third-party payment channels that are mainly due to timing difference between the Group’s receipts from the third-party payment channels versus the third-party payment channels’ cash receipts from the customers.
[2] Inventories are stated at the lower of cost and net realizable value. Cost is determined using the first-in, first-out method (FIFO) for all inventories.