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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-Based Compensation |
Schedule of assumptions used to estimate the fair value of options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the years ended December 31,
​ |  | 2017 |  | 2018 |  | 2019
Risk-free interest rates | ​ | 2.26%-2.57% | ​ | 2.97%-3.13% | ​ | 1.50%-2.90%
Expected volatility | ​ | 48.08%-49.35% | ​ | 46.23%-48.63% | ​ | 43.52%-57.59%
Expected dividend yield | ​ | 0% | ​ | 0% | ​ | 0%
Exercise multiple | ​ | 2.80 | ​ | 2.80 |  | 2.80
Post-vesting forfeit rate | ​ | 0% | ​ | 0% | ​ | 0%
Fair value of underlying Ordinary Shares | ​ | $0.0858-$0.5359 | ​ | $1.5146-$5.7400 | ​ | $4.8550-$8.9875
Fair value of share option | ​ | $0.0808-$0.5302 | ​ | $1.5091-$5.7335 | ​ | $4.8485-$8.9810
Schedule of recognized share-based compensation expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended
​ | ​ | December 31,
​ | ​ | 2017 | ​ | 2018 | ​ | 2019 | ​ | 2019
​ |  | RMB | ​ | RMB |  | RMB |  | US$
Costs of revenues | ​ | 796 | ​ | 3,488 | ​ | 23,835 |  | 3,424
Sales and marketing expenses | ​ | 1,675 | ​ | 405,805 | ​ | 860,862 |  | 123,655
General and administrative expenses i) / ii) | ​ | 108,141 | ​ | 6,296,186 | ​ | 786,641 |  | 112,994
Research and development | ​ | 5,893 | ​ | 136,094 | ​ | 886,368 |  | 127,319
​ | ​ | 116,505 | ​ | 6,841,573 | ​ | 2,557,706 |  | 367,392
i) For the year ended December 31, 2017, the Company recorded RMB103,125, in share-based compensation expenses in connection with the repurchase of Class B ordinary shares from the Founder. No such transaction took place during the years ended December 31, 2018 and 2019. ii) In April 2018, the Company issued 254,473,500 Class A ordinary shares to a company controlled by the Founder at the par value of US$0.000005 per share pursuant to a shareholders’ resolution. The difference between the par value and estimated fair value of ordinary shares on the grant date was recorded as a one-time share-based compensation expense of RMB5,953,717 in general and administration expenses. No such transaction took place during the years ended December 31, 2017 and 2019.
RSU |
Share-Based Compensation |
Summary of Group's share-based compensation activities | ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | average
​ | ​ | Number | ​ | grant date
​ | ​ | of RSUs | ​ | fair value
​ | ​ | ​ | ​ | US$
Outstanding as of January 1, 2018 |  | — |  | —
Granted |  | 8,295,240 |  | 6.2519
Outstanding as of December 31, 2018 | ​ | 8,295,240 | ​ | 6.2519
Granted | ​ | 36,409,188 | ​ | 6.7698
Vested | ​ | (567,636) | ​ | 6.9225
Forfeited | ​ | (2,761,724) | ​ | 6.4514
Outstanding as of December 31, 2019 |  | 41,375,068 |  | 6.6855
Stock option |
Share-Based Compensation |
Summary of Group's share-based compensation activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | average
​ | ​ | ​ | ​ | average | ​ | grant | ​ | Aggregate | ​ | remaining
​ | ​ | Number of | ​ | exercise | ​ | date fair | ​ | intrinsic | ​ | contractual
​ |  | share options |  | price |  | value |  | value |  | term
​ | ​ | ​ |  | US$ |  | US$ |  | US$ | ​ | Years
Outstanding as of January 1,2017 | ​ | 203,733,060 |  | 0.0065 |  | 0.0301 | ​ | 10,390 | ​ | 9.25
Granted | ​ | 78,560,000 |  | 0.0065 |  | 0.1736 |  | ​ |  | ​
Forfeited | ​ | (9,850,200) |  | 0.0065 |  | 0.0544 |  | ​ |  | ​
Outstanding as of December 31, 2017 | ​ | 272,442,860 | ​ | 0.0065 | ​ | 0.0706 | ​ | 144,258 | ​ | 8.57
Granted |  | 359,390,000 |  | 0.0065 |  | 3.6289 |  | ​ |  | ​
Forfeited | ​ | (2,240,000) |  | 0.0065 |  | 2.5006 | ​ | ​ | ​ | ​
Outstanding as of December 31, 2018 |  | 629,592,860 |  | 0.0065 |  | 2.0931 |  | 3,527,924 |  | 8.64
Granted |  | 76,665,380 |  | 0.0065 |  | 7.7632 |  | ​ |  | ​
Forfeited |  | (7,937,140) |  | 0.0065 |  | 5.7059 |  | ​ |  | ​
Outstanding as of December 31, 2019 |  | 698,321,100 |  | 0.0065 |  | 2.6745 |  | 6,598,087 |  | 7.83
Vested and expected to vest as of December 31, 2019 |  | 698,321,100 |  | 0.0065 |  | 2.6745 |  | 6,598,087 |  | 7.83
Exercisable as of December 31,2019 |  | 298,464,265 |  | 0.0065 |  | 1.1083 |  | 2,820,040 |  | 7.01
​

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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=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 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=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -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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