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Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CNY (¥) segment | Dec. 31, 2017 CNY (¥)
Fair value of financial instruments |  |
Equity investments with readily determinable fair value | ¥ 217,036 | ¥ 352
Available-for-sale debt securities | 130,358 | 145,930
Fair value of convertible senior notes | 4,260,195 | 4,090,808
Convertible senior notes | ¥ 4,327,268 | 4,094,903
Segment reporting |  |
Number of Operating Segments | segment | 2 |
Recurring |  |
Fair value of financial instruments |  |
Equity investments with readily determinable fair value | ¥ 217,036 | 352
Available-for-sale debt securities | 130,358 | 145,930
Recurring | Level 1 |  |
Fair value of financial instruments |  |
Equity investments with readily determinable fair value | 217,036 | 352
Recurring | Level 2 |  |
Fair value of financial instruments |  |
Available-for-sale debt securities | ¥ 130,358 | ¥ 145,930

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