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Short-term Investments | 12 Months Ended
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Dec. 31, 2019
Short-term Investments |
Short-term Investments | 4. Short-term Investments Short-term investments classification as of December 31, 2018 and 2019 were shown as below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ The gross unrecognized holding gain or loss on the held-to-maturity debt securities was nil and nil as of December 31, 2018 and 2019, respectively. The cost of trading debt securities was nil and RMB795,849 (US$114,317), with gross unrealized gain or loss of nil and nil, as of December 31, 2018 and 2019, respectively. For the years ended December 31, 2017, 2018 and 2019, interest income related to debt securities was RMB12,483, RMB115,737 and RMB500,298 (US$71,863), respectively. As of December 31, 2018 and 2019, the cost of marketable equity securities was nil and RMB23,398 (US$3,361), respectively; and the unrealized loss included in the carrying amount was nil and RMB11,473 (US$1,648), respectively. For the years ended December 31, 2017, 2018 and 2019, the realized loss from the marketable equity securities was nil, nil and RMB5,435 (US$781), respectively.

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