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Share-Based Payment (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Share-Based Payment Arrangement [Abstract] |  |
Schedule of modification date fair value of the stock options was determined using the Binomial-Lattice Model |  |
|  | 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 yield(5) |  | 0.00%
Weighted average fair value of options modified |  | $ 4.70 – $5.36
(1) Exercise price Exercise price was extracted from option agreements. (2) Expected lives Expected lives was derived from option agreements. (3) Volatility The volatility of the underlying common shares during the lives of the options was estimated based on the historical stock price volatility of comparable listed companies over a period comparable to the expected term of the options and the implied volatility of the Company. (4) Risk-free interest rate Risk-free interest rate was estimated based on the market yield of US Government Bond with maturity close to the expected term of the options, plus country risk spread. (5) Expected dividend yield The dividend yield was estimated by the Company based on its expected dividend policy over the expected term of the options.
|  | Year Ended December 31, 2021
Expected term (years)(1) |  | 2.18 – 2.35 |
Volatility(2) |  | 63.06 | % – 64.31%
Average correlation coefficient of peer companies(3) |  | 0.7960 – 0.8120 |
Risk-free interest rate(4) |  | 0.31 | % – 0.55%
Expected dividend yield(5) |  | 0.00 | %
Schedule of share options activity |
Stock options life |  | Number of Shares |  | Weighted Average Exercise Price (US$) |  | Weighted Average Grant Date Fair Value (US$) |  | Weighted Average Remaining Contractual Life
Outstanding as of January 1, 2021 |  | 34,737,967 |  |  | $ | 6.19 |  | $ | 2.92 |  | 9.0
Grant |  | — |  |  |  | — |  |  | — |  |
Forfeited |  | (913,710 | ) |  |  | 6.28 |  |  | 2.97 |  |
Outstanding as of March 31, 2021 |  | 33,824,257 |  |  | $ | 6.19 |  | $ | 2.92 |  | 8.7
Expected to vest and exercisable as of March 31, 2021 |  | 33,824,257 |  |  | $ | 6.19 |  | $ | 2.92 |  | 8.7
Outstanding as of January 1, 2022 |  | 33,503,657 |  |  |  | 6.19 |  |  | 4.95 |  | 7.9
Forfeited |  | (72,135 | ) |  |  | 6.28 |  |  | 4.92 |  |
Outstanding as of March 31, 2022 |  | 33,431,522 |  |  | $ | 6.18 |  | $ | 4.98 |  | 7.7
Expected to vest and exercisable as of March 31, 2022 |  | 33,431,522 |  |  | $ | 6.18 |  | $ | 4.98 |  | 7.7
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, 2019 |  | 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
Expected to vest and exercisable as of December 31, 2019 |  | 7,578,503 |  |  | 5.50 |  | 2.14 |  |  | 7.1
Outstanding as of January 1, 2020 |  | 7,578,503 |  |  | 5.50 |  | 2.14 |  |  | 7.1
Grant |  | 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
Outstanding as of January 1, 2021 |  | 34,737,967 |  |  | 6.19 |  | 2.92 |  |  | 9.0
Granted |  | — |  |  | — |  | — |  |  |
Forfeited |  | (1,234,310 | ) |  | 6.28 |  | 3.20 |  |  |
Outstanding as of December 31, 2021 |  | 33,503,657 |  |  | 6.19 |  | 4.95 | ​(a) |  | 7.9
Expected to vest and exercisable as of December 31, 2021 |  | 33,503,657 |  |  | 6.19 |  | 4.95 | ​(a) |  | 7.9
(a) The amount represented weighted average modification date value per share.
Schedule non-vested shares activity |
|  | Number on Non-Vested Shares |  | Weighted Average Grant Date Fair Value per Share (US$)
Outstanding as of January 1, 2021 |  | 23,027,399 |  | $ | 0.93
Outstanding as of March 31, 2021 |  | 23,027,399 |  | $ | 0.93
Outstanding as of March 31, 2022 |  | 23,027,399 |  | $ | 8.741
1 The amount represented modification date value per share.As of modification date, the settled price was the capped price as described above.
|  | Number of Non-Vested Shares |  | Weighted Average Grant Date Fair Value Per Share (US$)
Outstanding as of January 1, 2021 |  | — |  |  |  | —
Outstanding as of March 31, 2021 |  | — |  |  |  | —
Outstanding as of January 1, 2022 |  | 671,441 |  |  |  | 9.08
Grant |  | 38,566 |  |  | $ | 6.78
Vested |  | (8,124 | ) |  | $ | 8.52
Forfeited |  | (13,196 | ) |  | $ | 8.87
Outstanding as of March 31, 2022 |  | 688,687 |  |  | $ | 8.96
|  | Number on Non-Vested Shares |  | Weighted Average Grant Date Fair Value per Share (US$)
Outstanding as of January 1, 2019 |  | 17,291,560 |  |  | 0.96 |
Forfeited |  | (772,341 | ) |  | 1.60 |
Transfer from non-vested shares |  | 3,289,837 |  |  | 0.64 |
Outstanding as of December 31, 2019 |  | 19,809,056 |  |  | 0.90 |
Forfeited |  | (71,494 | ) |  | 1.42 |
Transfer from non-vested shares |  | 3,289,837 |  |  | 1.14 |
Outstanding as of December 31, 2020 |  | 23,027,399 |  |  | 0.93 |
Forfeited |  | — |  |  | — |
Outstanding as of December 31, 2021 |  | 23,027,399 |  |  | 8.74 | ​(a)
(a) The amount represented weighted average modification date value per share. As of modification date, the settled price was the capped price as described above.
|  | Number of Non-Vested Shares |  | Weighted Average Grant Date Fair Value Per Share (US$)
Outstanding as of January 1, 2019 |  | 5,578,012 |  |  | 0.93
Transfer to capped non-vested share units |  | (2,288,175 | ) |  | 0.64
Outstanding as of December 31, 2019 |  | 3,289,837 |  |  | 1.14
Transfer to capped non-vested share units |  | (3,289,837 | ) |  | 1.14
Outstanding as of December 31, 2020 |  | — |  |  | —
Grant |  | 727,600 |  |  | 9.07
Vested |  | (14,279 | ) |  | 8.52
Forfeited |  | (41,880 | ) |  | 9.05
Outstanding as of December 31, 2021 |  | 671,441 |  |  | 9.08
Schedule of classification of stock-based compensation |
|  | Three Months Ended March 31, 2022
Cost of revenues |  | $ | 1,934
General and administrative expenses |  |  | 18,136
Research and development expenses |  |  | 5,139
Selling and marketing expenses |  |  | 2,921
Construction in process |  |  | 162
Total |  | $ | 28,292
|  | Year Ended December 31,
|  | 2019 |  | 2020 |  | 2021
Cost of revenues |  | $ | — |  | $ | — |  | $ | 4,309
General and administrative expenses |  |  | — |  |  | — |  |  | 59,492
Research and development expenses |  |  | — |  |  | — |  |  | 13,064
Selling and marketing expenses |  |  | — |  |  | — |  |  | 6,029
Construction in process |  |  | — |  |  | — |  |  | 237
Total |  | $ | — |  | $ | — |  | $ | 83,131

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