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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] |
Summary of Share Option Activity | The following table summarizes the share option activity for the year ended December 31, 2021:
Options Granted to Employees and Directors |  | Number of Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average grant-date Fair Value per Option |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
|  |  |  |  | RMB |  |  | RMB |  |  |  |  |  | RMB |
Outstanding, December 31, 2020 |  |  | 7,200,816 |  |  |  | 8.48 |  |  |  | 17.03 |  |  |  | 7.27 |  |  |  | 232,933 |
Granted |  |  | 1,367,791 |  |  |  | 7.26 |  |  |  | 24.61 |  |  |  | — |  |  |  | — |
Forfeited |  |  | 652,406 |  |  |  | 11.77 |  |  |  | 21.07 |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | 549,007 |  |  |  | 5.50 |  |  |  | 9.19 |  |  |  | — |  |  |  | — |
Cancelled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, December 31, 2021 |  |  | 7,367,194 |  |  |  | 8.18 |  |  |  | 18.66 |  |  |  | 6.09 |  |  |  | 48,464 |
Vested and expected to vest at December 31, 2021 |  |  | 7,367,194 |  |  |  | 8.18 |  |  |  | 18.66 |  |  |  | 6.09 |  |  |  | 48,464 |
Vested at December 31, 2021 |  |  | 5,496,609 |  |  |  | 7.73 |  |  |  | 14.37 |  |  |  | 5.35 |  |  |  | 35,908 |
Schedule of Assumptions Used to Estimate Fair Values of Share Options Granted | The following table presents assumptions used to estimate the fair values of share options granted for the years ended December 31, 2019, 2020 and 2021:
|  | 2019 |  | 2020 |  | 2021
Risk-free interest rate |  | 1.65% - 2.54% |  | 0.63% - 1.88% |  | 0.94% - 1.70%
Dividend yield |  | 0% |  | 0% |  | 0%
Expected volatility |  | 44.23% - 44.71% |  | 44.37% - 47.83% |  | 47.45% - 56.62%
Weighted average expected volatility |  | 44.53% |  | 46.37% |  | 50.26%
Expected exercise multiple |  | 2.5 |  | 2.5 - 2.8 |  | 2.2 - 2.8
Summary of Restricted Share Units | A summary of the restricted share units for the year ended December 31, 2021 was stated below:
Restricted Share Units Granted to Employees and Directors |  | Number of Share Units |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average grant-date Fair Value per Option |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
|  |  |  |  | RMB |  |  | RMB |  |  |  |  |  | RMB |
Outstanding, December 31, 2020 |  |  | 95,094 |  |  |  | — |  |  |  | 20.37 |  |  |  | 10.66 |  |  |  | 3,751 |
Granted |  |  | 119,568 |  |  |  | — |  |  |  | 13.92 |  |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | 95,096 |  |  |  | — |  |  |  | 19.09 |  |  |  | — |  |  |  | — |
Cancelled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, December 31, 2021 |  |  | 119,566 |  |  |  | — |  |  |  | 14.94 |  |  |  | 9.88 |  |  |  | 1,189 |
Vested and expected to vest at December 31, 2021 |  |  | 119,566 |  |  |  | — |  |  |  | 14.94 |  |  |  | 9.88 |  |  |  | 1,189 |
Exercisable at December 31, 2021 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Summary of Total Compensation Costs Recognized | Total compensation costs recognized for the years ended December 31, 2019, 2020 and 2021 were as follows:
|  | Year ended December 31, |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Cost of Revenue |  |  | 73 |  |  |  | 4 |  |  |  | 41 |  |  |  | 6 |
Research and development |  |  | 12,819 |  |  |  | 7,176 |  |  |  | 13,801 |  |  |  | 2,166 |
Sales and marketing |  |  | 6,040 |  |  |  | 3,965 |  |  |  | 2,609 |  |  |  | 409 |
General and administrative |  |  | 28,352 |  |  |  | 17,713 |  |  |  | 13,761 |  |  |  | 2,160 |
Total |  |  | 47,284 |  |  |  | 28,858 |  |  |  | 30,212 |  |  |  | 4,741 |

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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 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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