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CLASS A ORDINARY SHARES - Pre funded warrants (Details) - $ / shares
 6 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Class of Warrant or Right [Line Items]    
Weighted Average Exercise Price Outstanding Per Share $ 0.01  
Issued   $ 0.01
Exercised   0.01
Weighted Average Exercise Price Outstanding Per Share $ 0.01 $ 0.01
Weighted average remaining period, outstanding 4 years 11 months 15 days 5 years 5 months 15 days
Pre-funded warrants    
Class of Warrant or Right [Line Items]    
Warrants Outstanding 1,470,000  
Issued   2,800,000
Exercised   (1,330,000)
Warrants Outstanding 1,470,000 1,470,000