Stock-Based Compensation - Stock options, fair value assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Stock-Based Compensation
Fair value of options granted (in dollars per share)	$ 0.41	$ 1.95
Employee Stock Option
Stock-Based Compensation
Risk-free interest rate, (as a percent)	3.90%	4.00%
Expected dividend yield (as a percent)	0.00%	0.00%
Expected term (in years)	6 years
Expected volatility (as a percent)	87.70%	82.30%
Unrecognized stock-based compensation expense	$ 10.6
Weighted-average period for unrecognized compensation expense to be recognized	2 years
Employee Stock Option \| Minimum
Stock-Based Compensation
Expected term (in years)		6 years
Employee Stock Option \| Maximum
Stock-Based Compensation
Expected term (in years)		6 years 1 month 6 days

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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