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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Shares Activities | The following table sets forth the stock option shares activities under all the option plans for the years ended December 31, 2017, 2018 and 2019:
|  | Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
|  |  |  |  | US$ |  |  |  |  |  | US$ |
Outstanding at December 31, 2016 |  |  | 112,570,000 |  |  |  | 0.0650 |  |  |  | 3.37 |  |  |  | 22,688 |
Granted |  |  | 26,610,000 |  |  |  | 0.3020 |  |  |  | — |  |  |  | — |
Canceled/ Forfeited |  |  | (7,538,200 | ) |  |  | 0.0967 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2017 |  |  | 131,641,800 |  |  |  | 0.1108 |  |  |  | 2.69 |  |  |  | 172,618 |
Granted |  |  | 12,039,050 |  |  |  | 0.8942 |  |  |  | — |  |  |  | — |
Canceled/ Forfeited |  |  | (3,722,285 | ) |  |  | 0.1930 |  |  |  | — |  |  |  | — |
Expired |  |  | (300,000 | ) |  |  | 0.0040 |  |  |  | — |  |  |  | — |
Exercised |  |  | (44,005,360 | ) |  |  | 0.0543 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2018 |  |  | 95,653,205 |  |  |  | 0.2214 |  |  |  | 2.17 |  |  |  | 47,689 |
Granted |  |  | 19,275,000 |  |  |  | 0.6540 |  |  |  | — |  |  |  | — |
Canceled/ Forfeited |  |  | (6,490,415 | ) |  |  | 0.5964 |  |  |  | — |  |  |  | — |
Exercised |  |  | (53,873,360 | ) |  |  | 0.0977 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2019 |  |  | 54,564,430 |  |  |  | 0.4519 |  |  |  | 2.51 |  |  |  | 4,264 |
Vested and expected to vest at December 31, 2019 |  |  | 53,286,128 |  |  |  | 0.4523 |  |  |  | 2.51 |  |  |  | 4,143 |
Exercisable as of December 31, 2019 |  |  | 14,156,930 |  |  |  | 0.3075 |  |  |  | 1.54 |  |  |  | 3,221 |
Schedule of Fair Value of Each Option Granted Estimated Using Binomial Model Assumption | The fair value of each option granted under the Company’s Incentive Shares plan was estimated on the date of grant using the binomial model that uses the assumption noted in the following table:
|  | Options Granted in 2017 |  |  | Options Granted in 2018 |  |  | Options Granted in 2019 |
|  | RMB |  |  | RMB |  |  | RMB |
Risk-free interest rate |  |  | 1.97%~2.04 | % |  |  | 2.52%-2.75 | % |  |  | 2.62% |
Expected life (in years) |  |  | 5 |  |  |  | 5 |  |  |  | 5 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0% |
Expected volatility |  |  | 39.0%~41.9 | % |  |  | 37.74%-38.74 | % |  |  | 38.01% |
Exercise multiple |  |  | 2.8 |  |  |  | 2.2-2.8 |  |  |  | 2.2-2.8 |
Summary of Restricted Stock Units Activities Under All Incentive Plans | The following table sets forth the Company’s RSUs activities under all incentive plans for the years ended December 31, 2017, 2018 and 2019:
|  | Number of RSUs |  |  | Weighted- average grant date fair value |
|  |  |  |  | US$ |
Unvested at December 31, 2017 |  |  | — |  |  |  | — |
Granted |  |  | 7,822,280 |  |  |  | 1.4375 |
Vested |  |  | — |  |  |  | — |
Canceled/ Forfeited |  |  | (270,800 | ) |  |  | 1.3233 |
Unvested at December 31, 2018 |  |  | 7,551,480 |  |  |  | 1.4416 |
Granted |  |  | 9,406,495 |  |  |  | 0.7353 |
Vested |  |  | (1,534,570 | ) |  |  | 1.4645 |
Canceled/ Forfeited |  |  | (3,399,610 | ) |  |  | 1.0740 |
Unvested at December 31, 2019 |  |  | 12,023,795 |  |  |  | 0.9880 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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