Stockholders' Equity (Stock Option Activities) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2021 |
Dec. 31, 2020 |
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| Options rollforward | ||
| Stock Options, Outstanding, Number, Beginning Balance | 1,141,675 | |
| Options, Outstanding, Number, Ending Balance | 1,141,675 | 1,141,675 |
| Options vested and exercisable | 820,579 | |
| Weighted Average Exercise Price | ||
| Weighted Average Exercise Price, Beginning | $ 5.73 | |
| Weighted Average Exercise Price, Ending | 5.73 | $ 5.73 |
| Weighted Average Exercise Price, options vested and exercisable | $ 5.73 | |
| Weighted Average Remaining Contractual Life, Options outstanding (in years) | 6 years 21 days | 6 years 3 months 21 days |
| Weighted Average Remaining Contractual Life, Options vested and exercisable (in years) | 6 years 21 days | |
| Unrecognized share-based compensation | $ 0.1 | |
| Unrecognized compensation recognition period | 7 months 6 days |
| X | ||||||||||
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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