Stock-Based Compensation - Assumptions (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands |
9 Months Ended | |
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Sep. 30, 2021 |
Sep. 30, 2020 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected dividend yield | $ 0 | $ 0 |
| Minimum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Volatility | 90.01% | 74.61% |
| Expected term (in years) | 5 years 8 months 8 days | 5 years 6 months 18 days |
| Risk-free rate | 0.69% | 0.25% |
| Weighted average grant date fair value per share (in dollars per share) | $ 2.07 | $ 0.16 |
| Maximum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Volatility | 93.02% | 74.89% |
| Expected term (in years) | 5 years 11 months 23 days | 5 years 10 months 13 days |
| Risk-free rate | 0.82% | 0.39% |
| Weighted average grant date fair value per share (in dollars per share) | $ 3.00 | $ 0.18 |
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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