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Redeemable Noncontrolling Interests - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 CNY (¥) | Nov. 30, 2017 USD ($) | Apr. 30, 2017 CNY (¥) | Apr. 30, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Amount to be receive before distribution or payment |  |  |  |  | 100.00% | 100.00% |  |
Purchase shares from holders |  |  |  |  | 6 years | 6 years |  |
Redemption days |  |  |  |  | 90 days | 90 days |  |
Annual compound interest rate |  |  |  |  | 6.00% | 6.00% |  |
Implied pre-money valuation |  |  |  |  |  | $ 500,000 |  |
Conversion ratio of preference share to ordinary share |  |  |  |  | 1 | 1 |  |
Convertible preferred stock, conversion description |  |  |  |  | Each Live.me Preferred Shares shall automatically be converted into ordinary shares based on a one-for-one basis upon the earlier of (i) the closing of a Qualified IPO or (ii) the date specified by written consent or agreement of the holders of at least fifty percent (50%) of the then outstanding Series A Preferred Shares for conversion of Series A Preferred Shares or Series B Preferred Shares for conversion of Series B Preferred Shares, as adjusted in connection with share splits or share consolidation, reclassification, or other similar event. | Each Live.me Preferred Shares shall automatically be converted into ordinary shares based on a one-for-one basis upon the earlier of (i) the closing of a Qualified IPO or (ii) the date specified by written consent or agreement of the holders of at least fifty percent (50%) of the then outstanding Series A Preferred Shares for conversion of Series A Preferred Shares or Series B Preferred Shares for conversion of Series B Preferred Shares, as adjusted in connection with share splits or share consolidation, reclassification, or other similar event. |  |
Annual compound interest rate of Live.me |  |  |  |  | 6.00% | 6.00% |  |
Preferred stock, accretion | ¥ |  |  |  |  | ¥ 13,451 |  | ¥ 0 | ¥ 0
Live.me [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Annual compound interest rate |  |  |  |  | 6.00% | 6.00% |  |
Annual compound interest rate of Live.me |  |  |  |  | 6.00% | 6.00% |  |
IPO [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Proceeds from market |  |  |  |  |  | $ 50,000 |  |
Share Subscription and Purchase Agreement (SPA) [Member] | Live.me [Member] | Investors [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of preferred shares | ¥ 329,710 | $ 50,000 | ¥ 306,085 | $ 45,000 |  |  |  |
Equity interest in Live.me | 52.10% | 52.10% | 52.10% | 52.10% |  |  |  |

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