Stock-based compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 1,258	$ 390	$ 2,241	$ 581
Stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized compensation expense	10,800		$ 10,800
Weighted average period			2 years 10 months 24 days
Restricted Stock Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Weighted average period			2 years 8 months 12 days
Unrecognized compensation expense related to RSU	3,900		$ 3,900
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	164	85	264	115
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	100	37	179	49
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	142	60	276	82
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 852	$ 208	$ 1,522	$ 335