Stock-Based Compensation and Employee Benefit Plans - Fair Value of Shares Purchased Under Performance-based Stock Options (Details)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock options and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (minimum)	3.90%	3.70%
Risk-free interest rate (maximum)	4.10%	4.40%
Expected term (years)	6 years 1 month 6 days	6 years
Expected dividend yield	0.00%	0.00%
Expected volatility (minimum)	93.40%	95.30%
Expected volatility (maximum)	93.90%	97.10%
Performance Shares \| 2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (minimum)	3.80%	4.10%	4.90%
Risk-free interest rate (maximum)	5.00%	5.60%	5.60%
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility (minimum)	66.20%	54.10%	54.10%
Expected volatility (maximum)	115.20%	78.70%	74.10%
Performance Shares \| 2018 ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	6 months	6 months	6 months
Performance Shares \| 2018 ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	2 years	2 years	2 years

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 maximum 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 estimated measure of the minimum 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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- Definition

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

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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