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Subsequent events (Details) - Subsequent Event [Member]
Jan. 08, 2021
USD ($)
$ / shares
shares
Subsequent events (Details) [Line Items]  
Warrants to purchase ordinary shares exercise price | $ / shares $ 1.40
Gross proceeds | $ $ 6,192,286.80
Cash exercise of warrants | shares 4,423,062
Warrants to purchase ordinary shares | shares 2,629,812
Issuance of ordinary shares | shares 1,364,512
Exercise warrants | $ / shares $ 1.40
Initial warrant exercise price | $ / shares $ 11.50
Outstanding warrants percentage 55.50%
Agent fees | $ $ 5,730,000