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Share-based Compensation - Summary of restricted shares activities (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation      
Restricted shares, Vested (5,637,860) (1,812,960) (190,160)
Restricted shares      
Share-based Compensation      
Restricted shares, Beginning balance 3,625,000 9,857,000 24,928,000
Restricted shares, Awarded     2,607,000
Restricted shares, Forfeited     (7,821,000)
Restricted shares, Vested (3,625,000) (6,232,000) (9,857,000)
Restricted shares, Ending balance 0 3,625,000 9,857,000
Restricted weighted-average grant date fair value, Beginning balance $ 0.21 $ 0.23 $ 0.23
Restricted weighted-average grant date fair value, Awarded     0.27
Restricted weighted-average grant date fair value, Forfeited     0.26
Restricted weighted-average grant date fair value, Vested $ 0.21 0.24 0.22
Restricted weighted-average grant date fair value, Ending balance   $ 0.21 $ 0.23
Restricted share units      
Share-based Compensation      
Restricted shares, Beginning balance 12,264,000 4,510,000  
Restricted shares, Awarded 2,192,900 13,080,200 9,611,020
Restricted shares, Forfeited (2,612,000) (2,308,000) (5,101,000)
Restricted shares, Vested (3,649,000) (3,018,000)  
Restricted shares, Ending balance 8,196,000 12,264,000 4,510,000
Restricted weighted-average grant date fair value, Beginning balance $ 0.31 $ 0.20  
Restricted weighted-average grant date fair value, Awarded 0.07 0.30 $ 0.22
Restricted weighted-average grant date fair value, Forfeited 0.33 0.20 0.24
Restricted weighted-average grant date fair value, Vested 0.29 0.19  
Restricted weighted-average grant date fair value, Ending balance $ 0.29 $ 0.31 $ 0.20