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Stock Compensation - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] |  |  |
Expected term (in years) | 6 years 1 month 6 days |  |
Expected volatility, Minimum | 75.40% | 75.40% | 74.00%
Expected volatility, Maximum | 75.80% | 76.60% | 75.70%
Risk-free rate, Minimum | 0.90% | 0.60% | 0.40%
Risk-free rate, Maximum | 1.00% | 1.10% | 1.70%
Minimum [Member] |  |  |
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] |  |  |
Expected term (in years) |  | 5 years 6 months | 5 years 6 months
Maximum [Member] |  |  |
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Line Items] |  |  |
Expected term (in years) |  | 6 years 1 month 6 days | 6 years 1 month 6 days

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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 + Details
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- Definition Schedule Of Share Based Payment Award Stock Options Valuation Assumptions + References No definition available. + Details
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