STOCK-BASED COMPENSATION - Weighted-average Values And Assumptions Used for Stock Options (Details) - $ / shares |
12 Months Ended | |||
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Jan. 17, 2019 |
Oct. 12, 2018 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Expected life (years) | 6 years | 6 years | ||
| Dividend | 0.00% | 0.00% | ||
| Weighted-average exercise price | $ 1.99 | $ 2.61 | $ 1.84 | $ 2.33 |
| Weighted-average grant-date fair value | $ 1.42 | $ 1.76 | ||
| Maximum [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Risk-free interest rate | 1.67% | 3.05% | ||
| Volatility | 106.00% | 93.00% | ||
| Minimum [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Risk-free interest rate | 0.42% | 1.62% | ||
| Volatility | 96.00% | 91.00% | ||
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). 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 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 per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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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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