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Summary of Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total Assets | ¥ 970,771 | ¥ 1,837,448
Non Marketable Equity Investments [Member] |  |
Assets |  |
Total Assets | 856,211 | 86,501
Wealth Management Products [Member] |  |
Assets |  |
Total Assets | 114,560 | 1,694,660
Financial guarantee derivative [Member] |  |
Assets |  |
Total Assets |  | 56,287
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Total Assets | 114,560 | 1,694,660
Fair Value, Inputs, Level 2 [Member] | Wealth Management Products [Member] |  |
Assets |  |
Total Assets | 114,560 | 1,694,660
Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Total Assets | 856,211 | 142,788
Fair Value, Inputs, Level 3 [Member] | Non Marketable Equity Investments [Member] |  |
Assets |  |
Total Assets | ¥ 856,211 | 86,501
Fair Value, Inputs, Level 3 [Member] | Financial guarantee derivative [Member] |  |
Assets |  |
Total Assets |  | ¥ 56,287

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