Equity Incentive Plan - Weighted average assumptions (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)	0 years	6 years 3 days	5 years 10 months 17 days	5 years 11 months 19 days
Volatility		90.00%	85.90%	91.40%
Risk-free interest rate		1.00%	3.20%	0.60%
2019 Employee Stock Purchase Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)	6 months	6 months	6 months	6 months
Volatility	88.00%	91.10%	79.00%	91.10%
Risk-free interest rate	3.30%	0.10%	0.60%	0.10%
2019 Employee Stock Purchase Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)	2 years	2 years	2 years	2 years
Volatility	96.70%	98.50%	96.70%	107.60%
Risk-free interest rate	3.50%	0.20%	3.50%	0.20%