Stockholders' Equity - Assumptions Used (Details) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | |
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Dec. 31, 2020 |
Dec. 31, 2019 |
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| Stockholders' Equity | ||
| Dividend yield | 0.00% | |
| Employee Stock Option | ||
| Stockholders' Equity | ||
| Weighted average grant date fair value (in dollars per share) | $ 1.48 | $ 0.86 |
| Expected term of options (in years) | 6 years 1 month 6 days | 6 years 1 month 6 days |
| Risk-free interest rate (as a percent) | 0.60% | 1.90% |
| Expected volatility (as a percent) | 97.30% | 98.90% |
| Dividend yield | 0.00% | 0.00% |
| Unrecognized compensation expense | $ 4.4 | |
| Weighted average remaining period for recognition of unrecognized compensation expense | 3 years 3 months 3 days | |
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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 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 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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- Definition Weighted average grant-date fair value of options vested. No definition available.
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- Details
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