Earnings per share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator for basic and diluted loss per share
Net loss	$ (2,667)	$ (2,062)
Weighted average number of shares outstanding - basic (in shares)	66,919	51,629
Weighted average number of shares outstanding - diluted (in shares)	66,919	51,629
Net loss per share
Basic (in dollars per share)	$ (0.04)	$ (0.04)
Diluted (in dollars per share)	$ (0.04)	$ (0.04)