Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Share-Based Compensation - Summary of RSU activities (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 CNY (¥)
Weighted average grand date fair value
Weighted-average period for recognition of share-based compensation expense relating to unvested options	4 years 9 months 29 days	4 years 9 months 29 days
2018 Plan \| RSU
Number of RSUs
Outstanding at beginning of the year (in shares) \| shares	8,295,240	8,295,240
Granted (in shares) \| shares	36,409,188	36,409,188	8,295,240
Vested \| shares	(567,636)	(567,636)
Forfeited (in shares) \| shares	(2,761,724)	(2,761,724)
Outstanding at end of the year (in shares) \| shares	41,375,068	41,375,068	8,295,240
Weighted average grand date fair value
Outstanding at beginning of the year	$ 6.2519
Granted	6.7698			$ 6.2519
Vested	6.9225
Forfeited	6.4514
Outstanding at end of the year	6.6855			6.2519
Weighted average grant date fair value of RSUs granted	$ 6.6855			$ 6.2519	$ 6.6855
Total fair value of RSUs vested during the period	$ 3,889	¥ 27,073	¥ 0
Unrecognized share-based compensation expenses					$ 208,490	¥ 1,451,466
Weighted-average period for recognition of share-based compensation expense relating to unvested options	3 years 4 months 6 days	3 years 4 months 6 days