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Capitalization and net loss per share - Computation (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Earnings Per Share [Abstract]            
Number of ordinary shares per ADS 8       8  
Numerator:            
Net loss | $ $ (8,807) $ (16,743) $ (17,766) $ (24,837) $ (25,550) $ (42,603)
Denominator:            
Weighted-average shares outstanding, basic (in shares) 634,469,423   484,777,837   627,996,124 483,226,039
Weighted-average shares outstanding, diluted (in shares) 634,469,423   484,777,837   627,996,124 483,226,039
Net loss per share, basic (in dollars per share) | $ / shares $ (0.01)   $ (0.04)   $ (0.04) $ (0.09)
Net loss per share, diluted (in dollars per share) | $ / shares $ (0.01)   $ (0.04)   $ (0.04) $ (0.09)
Antidilutive securities excluded from computation of loss per share (in shares) 48,500,000   46,200,000   48,500,000 46,200,000