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Equity settled share-based payments - Option activities during years ended June 30, 2019 and 2020 (Details) - Share option
 12 Months Ended
Sep. 27, 2020
USD ($)
$ / shares
Jan. 16, 2020
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options, outstanding at the beginning | $     12,400,836 11,014,000
Number of options, granted | $ 4,703,500 11,035,000   4,703,500
Number of options, exercised | $     (1,783,180) (747,664)
Number of options, forfeited | $     (1,699,164) (2,569,000)
Number of options, outstanding at the end | $     8,918,492 12,400,836
Number of options, exercisable at the end | $     1,888,574 1,128,336
Number of options, non-vested at the end | shares     7,029,918 11,272,500
Weighted-average exercise price, outstanding at the beginning (in dollars per share)     $ 0.036 $ 0.036
Weighted-average exercise price, granted (in dollars per share) $ 0.036 $ 0.036   0.036
Weighted-average exercise price, exercised (in dollars per share)     0.036 0.036
Weighted-average exercise price, forfeited (in dollars per share)     0.036 0.036
Weighted-average exercise price, outstanding at the end (in dollars per share)     0.036 0.036
Weighted-average exercise price, exercisable at the end (in dollars per share)     0.036 0.036
Weighted-average exercise price, non-vested at the end (in dollars per share)     0.036 0.036
Weighted-average grant date fair value, outstanding at the beginning (in dollars per share)     3.71 3.08
Weighted-average grant date fair value, granted (in dollars per share) $ 4.89 $ 3.08   4.89
Weighted-average grant date fair value, exercised (in dollars per share)     3.64 3.08
Weighted-average grant date fair value, forfeited (in dollars per share)     4.01 3.10
Weighted-average grant date fair value, outstanding at the end (in dollars per share)     3.67 3.71
Weighted-average grant date fair value, exercisable at the end (in dollars per share)     3.39 3.08
Weighted-average grant date fair value, non-vested at the end (in dollars per share)     $ 3.74 $ 3.78