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Prepayment and Other Current Assets - Schedule of prepaid expenses and other current assets (Detail) ¥ in Thousands, $ in Thousands	Sep. 30, 2020 CNY (¥)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Prepaid Expense and Other Assets, Current [Abstract]
Deferred expenses for learning services	¥ 45,238		¥ 48,185
Prepayment for value-added taxes	36,739		18,034
Prepayment for promotion fees	27,879		20,777
Deferred charges	27,545		12,472
Interest receivable	17,893		6,252
Prepaid Sales Commission	12,098
Prepayment for rental expenses	7,215		1,237
Prepayment For Content Fees	3,036		3,201
Others	22,941		10,733
Total	¥ 200,584	$ 29,544	¥ 120,891

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Sum of the carrying amounts as of the balance sheet date of deferred costs capitalized at the end of the reporting period that are expected to be charged against earnings within one year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of consideration paid in advance for advertising that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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