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Share-Based Payment (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |  |
Schedule of stock option activity plan |
Share options life |  | Number of shares |  | Weighted Average Exercise Price (US$) |  | Weighted Average Grant Date Fair Value (US$) |  | Weighted Average Remaining Contractual
Outstanding as of January 1, 2020 |  | 7,578,503 |  |  | $ | 5.50 |  | $ | 2.14 |  | 7.1
Grant |  | 27,874,727 |  |  |  | 6.27 |  |  | 3.06 |  |
Forfeited |  | (1,196,158 | ) |  |  | 3.89 |  |  | 2.04 |  |
Outstanding as of September 30, 2020 |  | 34,257,072 |  |  | $ | 6.19 |  | $ | 2.90 |  | 9.2
Expected to vest and exercisable as of September 30, 2020 |  | 34,257,072 |  |  | $ | 6.19 |  | $ | 2.90 |  | 9.2
Outstanding as of January 1, 2021 |  | 34,737,967 |  |  |  | 6.19 |  |  | 2.92 |  | 9.0
Forfeited |  | (1,186,220 | ) |  |  | 6.27 |  |  | 3.13 |  |
Outstanding as of September 30, 2021 |  | 33,551,747 |  |  | $ | 6.19 |  | $ | 4.95 |  | 8.2
Expected to vest and exercisable as of September 30, 2021 |  | 33,551,747 |  |  | $ | 6.19 |  | $ | 4.95 |  | 8.2
Share options |  | Number of shares |  | Weighted average exercise price |  | Weighted average grant date fair value |  | Weighted average remaining contractual life
|  |  |  | (US$) |  | (US$) |  |
Outstanding as of January 1, 2018 |  | 9,034,556 |  |  | $ | 5.57 |  | $ | 2.19 |  | 9.1
Granted |  | 160,270 |  |  |  | 6.28 |  | $ | 1.41 |  |
Forfeited |  | (384,684 | ) |  |  | 6.28 |  | $ | 2.42 |  |
Outstanding as of December 31, 2018 |  | 8,810,178 |  |  | $ | 5.55 |  | $ | 2.16 |  | 8.1
Forfeited |  | (1,231,675 | ) |  |  | 5.83 |  | $ | 2.27 |  |
Outstanding as of December 31, 2019 |  | 7,578,503 |  |  | $ | 5.50 |  | $ | 2.14 |  | 7.1
Granted |  | 28,350,160 |  |  |  | 6.28 |  | $ | 3.09 |  |
Forfeited |  | (1,190,696 | ) |  |  | 3.89 |  | $ | 2.04 |  |
Outstanding as of December 31, 2020 |  | 34,737,967 |  |  |  | 6.19 |  |  | 2.92 |  | 9.0
Expected to vest and exercisable as of December 31, 2020 |  | 34,737,967 |  |  | $ | 6.19 |  | $ | 2.92 |  | 9.0
Schedule of weighted average assumptions applied to options |
|  | After modification
Exercise price(1) |  | $ | 4.37 – 6.28 |
Expected lives (years)(2) |  |  | 4.5 – 9.4 |
Volatility(3) |  |  | 47.6% – 53.1% |
Risk-free interest rate(4) |  |  | 1.26 – 1.87 | %
Expected dividend yields(5) |  |  | 0.00 | %
Weighted average fair value of options modified |  | $ | 4.70 – 5.36 |
|  | Nine Months Ended September 30, 2021
Expected term (years)(1) |  | 2.35 |
Volatility(2) |  | 63.06% |
Average correlation coefficient of peer companies(3) |  | 0.7960 |
Risk-free interest rate(4) |  | 0.31 | %
Expected dividend yields(5) |  | 0.00 | %
Grant date |  | For the years ended December 31, 2018
Risk-free interest rate(1) |  | 3.55 | %
Expected dividend yield(2) |  | 0.0 | %
Volatility(3) |  | 51.7 | %
Exercise multiple(4) |  | 2.2 |
Life of options(5) |  | 10 years |
Fair value of underlying ordinary shares(6) |  | $3.22 |
Grant date |  | For the years ended December 31, 2020
Risk-free interest rate(1) |  | 1.54% ~ 1.61% |
Expected dividend yield(2) |  | 0.0% |
Volatility(3) |  | 50.2% ~ 51.8% |
Exercise multiple(4) |  | 2.2 ~ 2.8 |
Life of options(5) |  | 10 years |
Fair value of underlying ordinary shares(6) |  | $6.10 ~ $8.21 |
Schedule non-vested shares activity |
|  | Number on Non-Vested Shares |  | Weighted Average Grant Date Fair Value per Share (US$)
Outstanding as of January 1, 2020 |  | 19,809,056 |  |  | $ | 0.90
Forfeited |  | (71,494 | ) |  | $ | 1.42
Transfer from non-vested shares |  | 3,289,837 |  |  | $ | 1.14
Outstanding as of September 30, 2020 |  | 23,027,399 |  |  | $ | 0.93
Outstanding as of January 1, 2021 |  | 23,027,399 |  |  | $ | 0.93
Outstanding as of September 30, 2021 |  | 23,027,399 |  |  | $ | 6.27
|  | Number of non-vested shares |  | Weighted average grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2020 |  | 3,289,837 |  |  | $ | 1.14
Transfer to non-vested share units |  | (3,289,837 | ) |  | $ | 1.14
Outstanding as of September 30, 2020 |  | — |  |  |  | —
Outstanding as of January 1, 2021 |  | — |  |  |  | —
Grant |  | 197,940 |  |  | $ | 9.60
Vested |  | (6,157 | ) |  | $ | 8.52
Outstanding as of September 30, 2021 |  | 191,783 |  |  | $ | 9.63
|  | Number of non-vested shares |  | Weighted Average Grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2018 |  | 7,008,101 |  |  | $ | 0.87
Forfeited |  | (1,430,089 | ) |  | $ | 0.64
Outstanding as of December 31, 2018 |  | 5,578,012 |  |  | $ | 0.93
Transfer to non-vested share units |  | (2,288,175 | ) |  | $ | 0.64
Outstanding as of December 31, 2019 |  | 3,289,837 |  |  | $ | 1.14
Transfer to non-vested share units |  | (3,289,837 | ) |  | $ | 1.14
Outstanding as of December 31, 2020 |  | — |  |  | $ | —
|  | Number of non-vested share units |  | Weighted Average Grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2018 |  | 18,235,550 |  |  | $ | 0.97
Forfeited |  | (943,990 | ) |  | $ | 1.18
Outstanding as of December 31, 2018 |  | 17,291,560 |  |  | $ | 0.96
Forfeited |  | (772,341 | ) |  | $ | 1.60
Transfer from non-vested shares |  | 3,289,837 |  |  | $ | 0.64
Outstanding as of December 31, 2019 |  | 19,809,056 |  |  | $ | 0.90
Forfeited |  | (71,494 | ) |  | $ | 1.42
Transfer from non-vested shares |  | 3,289,837 |  |  | $ | 1.14
Outstanding as of December 31, 2020 |  | 23,027,399 |  |  | $ | 0.93
Schedule of classification of stock-based compensation |
|  | Three Months Ended September 30, 2021
Cost of sales |  | $ | 2,306
General and administrative |  |  | 44,164
Research and development expenses |  |  | 8,303
Selling and marketing expenses |  |  | 3,518
Construction in process |  |  | 103
Total |  | $ | 58,394

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