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Segment Information (Details) ¥ in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 CNY (¥) | Sep. 30, 2018 CNY (¥) | Jun. 30, 2018 CNY (¥) | Mar. 31, 2018 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |
Net revenues | ¥ 200,000 | ¥ 150,000 | ¥ 120,000 | ¥ 65,000 | ¥ 651,013 | $ 94,686 | ¥ 280,666 | ¥ 117,353
Auto shows segment | Auto shows |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | 644,251 |  | 263,927 | 50,840
Auto shows segment | Group-purchase facilitation |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | 0 |  | 16,739 | 66,513
Auto shows segment | Virtual dealership, demand-side platform advertising services and others |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |
Net revenues |  |  |  |  | ¥ 6,762 |  | ¥ 0 | ¥ 0

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