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Short-term Investments - Additional information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Short-term Investments          
Gross unrecognized holding gain of the held-to-maturity debt securities     ¥ 0   ¥ 0
Gross unrecognized holding loss of the held-to-maturity debt securities     0   0
Cost of trading debt securities $ 114,317   0   795,849
Gross unrealized gain (loss) on debt trading securities   ¥ 0 0    
Interest income on short-term investments 71,863 500,298 115,737 ¥ 12,483  
Marketable Securities 3,361   0   ¥ 23,398
Unrealized loss for marketable equity securities 1,648 11,473      
Realized loss for marketable equity securities $ 781 ¥ 5,435 ¥ 0 ¥ 0