Stock-Based Compensation - Stock options, fair value assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Stock-Based Compensation
Fair value of options granted (in dollars per share)	$ 1.96	$ 6.56
Stock options
Stock-Based Compensation
Risk-free interest rate, minimum (as a percent)			3.57%	1.47%
Risk-free interest rate, maximum (as a percent)			3.98%	3.39%
Expected dividend yield (as a percent)			0.00%	0.00%
Expected volatility, minimum (as percentage)			81.69%	80.75%
Expected volatility, maximum (as percentage)			87.15%	87.42%
Unrecognized stock-based compensation expense	$ 14.4		$ 14.4
Weighted-average period for unrecognized compensation expense to be recognized			2 years 7 months 6 days
Stock options | Minimum
Stock-Based Compensation
Expected term (in years)			5 years 6 months	5 years 6 months
Stock options | Maximum
Stock-Based Compensation
Expected term (in years)			6 years 29 days	6 years 29 days