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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
SHARE-BASED COMPENSATION |
Summary of the option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | ​ | ​ | average
​ | ​ | ​ | ​ | Weighted | ​ | grant-date
​ | ​ | Number | ​ | average | ​ | fair value
​ |  | of options |  | exercise price |  | per option
​ |  |  |  | (RMB) |  | (RMB)
Options outstanding at January 1, 2018 |  | 28,087,236 |  | 5.1 |  | 3.2
Granted |  | 500,000 |  | 5.0 |  | 31.2
Exercised | ​ | (3,614,464) |  | 5.2 |  | 4.5
Forfeited | ​ | (193,340) | ​ | 5.0 | ​ | 6.2
​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2018 |  | 24,779,432 |  | 5.3 |  | 2.2
Granted |  | — |  | ​ |  | ​
Exercised | ​ | (10,150,336) | ​ | 5.6 | ​ | 3.5
Forfeited |  | — |  | ​ |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2019 |  | 14,629,096 |  | 5.4 |  | 1.7
Granted | ​ | — | ​ | ​ | ​ | ​
Exercised | ​ | (14,222,096) | ​ | 5.5 | ​ | 1.6
Forfeited | ​ | — | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2020 | ​ | 407,000 | ​ | 5.1 | ​ | 1.6
​ | ​ | ​ | ​ | ​ | ​ | ​
Options vested and expected to be vested at December 31, 2020 |  | 407,000 |  | 5.1 | ​ | 1.6
​
Summary of information with respect to stock options outstanding and stock options exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​
​ | ​ | ​ | ​ | average | ​ | Weighted
​ | ​ | Number |  | remaining |  | average
​ |  | of shares |  | contractual life |  | exercise price
​ | ​ | ​ |  | (years) |  | (RMB)
Options outstanding and exercisable | ​ | 407,000 | ​ | 0.3 | ​ | 5.1
Summary of the restricted share activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted average grant-
​ | ​ | Number of | ​ | date fair value per share
​ |  | Shares |  | (RMB)
​ | ​ | ​ |  | ​
Unvested at January 1, 2018 | ​ | 24,525,620 | ​ | 5.3
Granted | ​ | 13,202,512 | ​ | 14.5
Vested | ​ | (7,326,620) | ​ | 6.0
Forfeited | ​ | (891,008) | ​ | 5.9
​ | ​ | ​ | ​ | ​
Unvested at December 31, 2018 |  | 29,510,504 | ​ | 9.3
Granted |  | 14,551,472 | ​ | 34.2
Vested |  | (9,122,432) | ​ | 9.3
Forfeited |  | (1,582,248) | ​ | 10.7
​ | ​ | ​ | ​ | ​
Unvested at December 31, 2019 | ​ | 33,357,296 | ​ | 22.4
Granted | ​ | 11,710,848 | ​ | 66.7
Vested | ​ | (12,684,640) | ​ | 14.1
Forfeited | ​ | (1,364,736) | ​ | 25.1
​ | ​ | ​ | ​ | ​
Unvested at December 31, 2020 |  | 31,018,768 | ​ | 42.4
​
Assumptions used to estimate fair value of restricted shares granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Grant date: |  | August 2018 |  | August 2019 |  | August 2020 | ​
Risk-free rate of return |  | 2.047% - 2.418 | % | 1.67% - 1.88 | % | 0.14% - 0.19 | %
Volatility |  | 71.85 | % | 63.22 | % | 59.23 | %
Expected dividend yield |  | 0.00 | % | 0.00 | % | 0.00 | %
Share price at grant date |  | US$3.125 | ​ | US$5.02375 | ​ | US$10.1475 | ​
​ |  | (RMB 21.3) | ​ | (RMB 34.6) | ​ | (RMB 70.5) | ​
Expected term |  | 1 – 3 years | ​ | 1 – 3 years | ​ | 1 – 3 years | ​
Summary of share-based compensation expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Costs of revenue |  | 18,008 |  | 46,007 | ​ | 89,943
Selling and marketing expenses |  | 25,213 |  | 39,436 | ​ | 54,204
General and administrative expenses |  | 61,707 |  | 101,949 | ​ | 184,943
Research and development expenses | ​ | 949 | ​ | 2,364 | ​ | 4,596
Total share-based compensation expenses |  | 105,877 |  | 189,756 | ​ | 333,686

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted shares, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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