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Stock option plan - Stock option activity (Details) - 2019 Equity Incentive Plan - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of options
Outstanding, beginning of period	3,499,934	1,844,188	1,897,206
Granted	446,800	2,018,796	24,067
Exercised	(164,075)	(322,267)	(2,306)
Cancelled/Forfeited	(11,200)	(40,783)	(74,779)
Outstanding, end of period	3,771,459	3,499,934	1,844,188	1,897,206
Exercisable	1,968,116
Vested or expected to vest	3,771,459
Weighted‑average exercise price per share
Outstanding, beginning of period	$ 5.49	$ 0.82	$ 1.46
Granted	35.16	8.82	1.01
Exercised	0.92	0.23	0.92
Cancelled/Forfeited	38.78	0.99	17.31
Outstanding, end of period	9.10	$ 5.49	$ 0.82	$ 1.46
Exercisable	3.52
Vested or expected to vest	$ 9.10
Weighted average remaining contractual term (in years)
Outstanding	6 years 9 months 18 days	7 years 6 months	7 years 7 months 6 days	8 years 3 months 18 days
Exercisable	6 years 1 month 6 days
Vested or expected to vest	6 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding	$ 6,945,112
Exercisable	5,602,168
Vested or expected to vest	$ 6,945,112
Additional Disclosures
Weighted average grant date fair value of options granted	$ 24.20	$ 6.68	$ 0.69

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