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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Stock Options, Activity | The following table sets forth the stock options activity for the years ended December 31, 2019, 2020 and 2021:
|  | Number of shares |  |  | Weighted- average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value |
|  |  |  |  | US$ |  |  |  |  |  | 000’US$ |
Outstanding as of December 31, 2019 |  |  | 93,846,550 |  |  |  | 0.19 |  |  |  | 3.77 |  |  |  | 30,442 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | (16,014,140 | ) |  |  | 0.11 |  |  |  |  |  |  |  |  |
Exercised |  |  | (9,151,290 | ) |  |  | 0.10 |  |  |  |  |  |  |  |  |
Expired |  |  | (115,200 | ) |  |  | 0.14 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2020 |  |  | 68,565,920 |  |  |  | 0.22 |  |  |  | 2.65 |  |  |  | 2,826 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | (5,655,230 | ) |  |  | 0.26 |  |  |  |  |  |  |  |  |
Exercised |  |  | (748,730 | ) |  |  | 0.10 |  |  |  |  |  |  |  |  |
Expired |  |  | (231,520 | ) |  |  | 0.28 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2021 |  |  | 61,930,440 |  |  |  | 0.21 |  |  |  | 1.73 |  |  |  | — |
Vested and expected to vest as of December 31, 2021 |  |  | 61,930,440 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable as of December 31, 2021 |  |  | 59,693,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The Group uses the Binominal option pricing model to estimate the fair value of stock options. The assumptions used to value the Company’s options modified were as follow:
|  | 2020 |  |  | 2021 |
Exercise price (US$) |  |  | N/A |  |  |  | 0.0925 |
Exercise multiple |  |  | N/A |  |  |  | 2.2/2.8 |
Risk-free interest rate |  |  | N/A |  |  |  | 0.24%/0.33% |
Expected term (in years) |  |  | N/A |  |  |  | 6 |
Expected dividend yield |  |  | N/A |  |  |  | 0.00% |
Expected volatility |  |  | N/A |  |  |  | 52.96%/55.13% |
Expected forfeiture rate (post-vesting) |  |  | N/A |  |  |  | 5% |
Fair value of the underlying shares on the date of options grants (US$) |  |  | N/A |  |  |  | 0.23 |
Fair value of share option (US$) |  |  | N/A |  |  |  | 0.15 |
Nonvested Restricted Stock Shares Activity | A summary of activities of the service-based RSUs for the years ended December 31, 2019, 2020 and 2021 is presented below:
|  | Number of RSUs |  |  | Weighted-Average Grant-Date Fair Value |
|  |  |  |  | US$ |
Unvested at December 31, 2019 |  |  | 36,834,850 |  |  |  | 0.76 |
Granted |  |  | 64,210,210 |  |  |  | 0.43 |
Vested |  |  | (954,960 | ) |  |  |  |
Forfeited |  |  | (51,629,000 | ) |  |  |  |
Expired |  |  | (500,000 | ) |  |  |  |
Unvested at December 31, 2020 |  |  | 47,961,100 |  |  |  | 0.63 |
Granted |  |  | 55,988,000 |  |  |  | 0.21 |
Vested |  |  | (12,908,750 | ) |  |  |  |
Forfeited |  |  | (45,336,000 | ) |  |  |  |
Unvested at December 31, 2021 |  |  | 45,704,350 |  |  |  | 0.45 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, 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 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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