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Share-Based Compensation - Recognized share-based compensation expenses (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	1 Months Ended			12 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares	Apr. 30, 2018 CNY (¥) shares	Feb. 28, 2017 CNY (¥)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Recognized share-based compensation expenses
Share-based compensation expense recognized				$ 995,065	¥ 6,841,573	¥ 116,505	¥ 4,064
Shares issued | shares				254,473,500	254,473,500
Costs of revenues
Recognized share-based compensation expenses
Share-based compensation expense recognized				$ 507	¥ 3,488	796	276
Sales and marketing expenses
Recognized share-based compensation expenses
Share-based compensation expense recognized				59,022	405,805	1,675	563
General and administrative expenses
Recognized share-based compensation expenses
Share-based compensation expense recognized				915,742	6,296,186	108,141	1,477
Share-based compensation expense recognized on repurchase of ordinary shares | ¥			¥ 103,125
General and administrative expenses | A company controlled by the Founder | Class B ordinary shares
Recognized share-based compensation expenses
Share-based compensation expense recognized on repurchase of ordinary shares | ¥					0	103,125	0
General and administrative expenses | A company controlled by the Founder | Class A ordinary shares
Recognized share-based compensation expenses
Share-based compensation expense recognized	$ 865,932	¥ 5,953,717				0	0
Shares issued | shares	254,473,500	254,473,500
The per share amount of share-based compensation expense | $ / shares	$ 0.000005
Research and development expenses
Recognized share-based compensation expenses
Share-based compensation expense recognized				$ 19,794	¥ 136,094	¥ 5,893	¥ 1,748

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- Definition

The amount of share-based compensation expense recognized on repurchase of ordinary shares.

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The per share amount of share-based compensation expense

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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