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v3.20.1

Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Short-term Investments |
Schedule of Short-term investments classification | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ | 2018 | ​ | 2019 | ​ | 2019
​ | ​ | RMB | ​ | RMB | ​ | US$
Debt securities: | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity |  | 7,630,689 |  | 34,481,053 |  | 4,952,893
Trading |  | — |  | 795,849 |  | 114,317
Equity securities: | ​ | ​ | ​ | ​ | ​ | ​
Marketable |  | — |  | 11,925 |  | 1,713
​ |  | 7,630,689 |  | 35,288,827 |  | 5,068,923

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- References No definition available. + Details
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