Earnings per share - Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss	$ (13,198)	$ (4,668)	$ (24,815)	$ (13,496)
Denominator:
Weighted-average common shares outstanding, basic (in shares)	112,023,503	111,877,937	111,981,014	111,865,630
Weighted-average common shares outstanding, diluted (in shares)	112,023,503	111,877,937	111,981,014	111,865,630
Net loss per share, basic (in usd per share)	$ (0.12)	$ (0.04)	$ (0.22)	$ (0.12)
Net loss per share, diluted (in usd per share)	$ (0.12)	$ (0.04)	$ (0.22)	$ (0.12)