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SHARE-BASED COMPENSATION - Summary of aggregate option activities (Detail) - CNY (¥) ¥ / shares in Units, ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Number of Options - Beginning balance | 5,699,000 |
Options granted in period | 1,583,000 |
Number of Option - Exercised | (1,981,000) |
Number of Options - Forfeited | (921,000) |
Number of Options - Ending balance | 4,380,000 | 5,699,000
Number of Options - Options exercisable | 2,369,000 |
Number of Options - Options vested or expected to be vested | 4,380,000 |
Weighted Average Exercise Price - Beginning balance | ¥ 3.5 |
Weighted Average Exercise Price - Ending balance | 3.5 | ¥ 3.5
Weighted Average Exercise Price - Options exercisable | 3.5 |
Weighted Average Exercise Price - Options vested or expected to be vested | ¥ 3.5 |
Weighted Average Remaining Contract Life - Options outstanding | 2 years 7 months 17 days | 2 years 6 months 3 days
Weighted Average Remaining Contract Life - Options exercisable | 2 years 2 months 12 days |
Weighted Average Remaining Contract Life - Options vested or expected to be vested | 2 years 7 months 17 days |
Aggregate Intrinsic Value - Options outstanding | ¥ 118,421 | ¥ 189,093
Aggregate Intrinsic Value - Options exercisable | 56,756 |
Aggregate Intrinsic Value - Options vested or expected to be vested | ¥ 118,421 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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