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Share-based payment (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |  |
Schedule of stock option activity plan |
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, 2020 |  | 47,277 |  |  | $ | 881.97 |  | $ | 343.83 |  | 7.1
Forfeited |  | (4,462 | ) |  |  | 366.00 |  |  | 285.11 |  |
Outstanding as of March 31, 2020 |  | 42,815 |  |  | $ | 935.74 |  | $ | 349.95 |  | 7.0
Outstanding as of June 30, 2020 |  | 42,815 |  |  | $ | 935.74 |  | $ | 349.95 |  | 6.8
Expected to vest and exercisable as of June 30, 2020 |  | 42,815 |  |  | $ | 935.74 |  | $ | 349.95 |  | 6.8
Outstanding as of January 1, 2021 |  | 216,706 |  |  |  | 991.99 |  |  | 468.60 |  | 9.0
Forfeited |  | (5,700 | ) |  |  | 1005.85 |  |  | 475.71 |  |
Outstanding as of March 31, 2021 |  | 211,006 |  |  | $ | 991.62 |  | $ | 468.41 |  | 8.7
Forfeited |  | (800 | ) |  |  | 1005.85 |  |  | 475.71 |  |
Outstanding as of June 30, 2021 |  | 210,206 |  |  | $ | 991.57 |  | $ | 468.38 |  | 8.5
Expected to vest and exercisable as of June 30, 2021 |  | 210,206 |  |  | $ | 991.57 |  | $ | 468.38 |  | 8.5
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 |  | 56,362 |  |  | $ | 892.24 |  | $ | 350.52 |  | 9.1
Granted |  | 1,000 |  |  |  | 1,005.85 |  | $ | 225.30 |  |
Forfeited |  | (2,400 | ) |  |  | 1,005.85 |  | $ | 387.63 |  |
Outstanding as of December 31, 2018 |  | 54,962 |  |  | $ | 889.35 |  | $ | 346.63 |  | 8.1
Forfeited |  | (7,685 | ) |  |  | 934.82 |  | $ | 363.82 |  |
Outstanding as of December 31, 2019 |  | 47,277 |  |  | $ | 881.97 |  | $ | 343.83 |  | 7.1
Granted |  | 176,890 |  |  |  | 1,005.85 |  | $ | 495.95 |  |
Forfeited |  | (7,461 | ) |  |  | 623.31 |  | $ | 326.36 |  |
Outstanding as of December 31, 2020 |  | 216,706 |  |  |  | 991.99 |  |  | 468.60 |  | 9.0
Expected to vest and exercisable as of December 31, 2020 |  | 216,706 |  |  | $ | 991.99 |  | $ | 468.60 |  | 9.0
Schedule of weighted average assumptions applied to options |  |
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) |  | $515.40 |
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) |  | $976.98 ~ $1,316.40 |
Schedule non-vested shares activity |
|  | Number of non-vested shares |  | Weighted average grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2020 |  | 20,523 |  |  | $ | 182.13
Transfer to non-vested share units |  | (20,523 | ) |  | $ | 182.13
Outstanding as of March 31, 2020 |  | — |  |  | $ | —
Outstanding as of June 30, 2020 |  | — |  |  | $ | —
|  | Number of non-vested shares |  | Weighted average grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2020 |  | 123,575 |  |  | $ | 143.89
Forfeited |  | (446 | ) |  | $ | 227.24
Transfer from non-vested shares |  | 20,523 |  |  | $ | 182.13
Outstanding as of March 31, 2020 |  | 143,652 |  |  | $ | 149.10
Outstanding as of June 30, 2020 |  | 143,652 |  |  | $ | 149.10
Outstanding as of January 1, 2021 |  | 143,652 |  |  | $ | 149.10
Forfeited |  | — |  |  | $ | —
Outstanding as of June 30, 2021 |  | 143,652 |  |  | $ | 149.10
|  | Number of non-vested shares |  | Weighted Average Grant date fair value per share
|  |  |  | (US$)
Outstanding as of January 1, 2018 |  | 43,723 |  |  | $ | 139.80
Forfeited |  | (8,923 | ) |  | $ | 102.35
Outstanding as of December 31, 2018 |  | 34,800 |  |  | $ | 149.40
Transfer to non-vested share units |  | (14,277 | ) |  | $ | 102.35
Outstanding as of December 31, 2019 |  | 20,523 |  |  | $ | 182.13
Transfer to non-vested share units |  | (20,523 | ) |  | $ | 182.13
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 |  | 120,007 |  |  | $ | 155.55
Forfeited |  | (5,890 | ) |  | $ | 188.84
Outstanding as of December 31, 2018 |  | 114,117 |  |  | $ | 153.83
Forfeited |  | (4,819 | ) |  | $ | 255.99
Transfer from non-vested shares |  | 14,277 |  |  | $ | 102.35
Outstanding as of December 31, 2019 |  | 123,575 |  |  | $ | 143.89
Forfeited |  | (446 | ) |  | $ | 227.24
Transfer from non-vested shares |  | 20,523 |  |  | $ | 182.13
Outstanding as of December 31, 2020 |  | 143,652 |  |  | $ | 149.10

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