Net loss per share - Calculation of Basic and Diluted Net Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss attributable to common stockholders	$ (25,649)	$ (17,989)
Weighted-average shares used in computing net loss per share attributable to common stockholders
Basic (in shares)	139,405,294	36,178,304
Diluted (in shares)	139,405,294	36,178,304
Net loss per share attributable to common stockholders
Basic (in dollars per share)	$ (0.18)	$ (0.50)
Diluted (in dollars per share)	$ (0.18)	$ (0.50)