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Significant Accounting Policies - Revenue recognition (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2019 CNY (¥) item | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Revenue recognition |  |  |  |
Maximum economic benefit period from paid columns and online courses | 1 year | 1 year |  |
Number of forms of offline training services | item | 2 | 2 |  |
Total revenues | $ 94,172 | ¥ 655,606,000 | ¥ 299,093,000 | ¥ 120,507,000
Contract assets |  | 0 | 0 |
Revenue recognized included in contract liabilities balance at the beginning of the period |  | 4,230,000 | 3,550,000 | 0
Online advertising services |  |  |  |
Revenue recognition |  |  |  |
Total revenues | 40,712 | 283,426,000 | 173,783,000 | 73,958,000
Integrated marketing |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 250,344,000 | 40,017,000 | 10,279,000
Offline events |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 53,861,000 | 53,711,000 | 31,670,000
Consulting |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 15,264,000 | 6,510,000 | 516,000
Enterprise value-added services |  |  |  |
Revenue recognition |  |  |  |
Total revenues | 45,889 | 319,469,000 | 100,238,000 | 42,465,000
Institutional investor subscription services |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 20,039,000 | 14,368,000 | 2,299,000
Enterprise subscription services |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 2,077,000 |  |
Individual subscription services |  |  |  |
Revenue recognition |  |  |  |
Total revenues |  | 30,595,000 | 10,704,000 | 1,785,000
Subscription services |  |  |  |
Revenue recognition |  |  |  |
Total revenues | $ 7,571 | ¥ 52,711,000 | ¥ 25,072,000 | ¥ 4,084,000

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