STOCK-BASED COMPENSATION - Performance Stock (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in units)	2,471,500
Granted (per unit) \| $ / shares	$ 1.14
Non-vested at the end (in units)	1,716,100
Outstanding at the end (per unit) \| $ / shares	$ 1.38
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of the liability \| $	$ 5.5
Granted (in units)	994,100
Liability-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum risk free interest rate	0.14%
Maximum risk free interest rate	0.15%
Minimum expected volatility	92.30%
Maximum expected volatility	96.50%
Expected dividend yield	0.00%
Liability-classified \| Valuation Technique, Probability Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in units)	994,100
Equity-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum risk free interest rate	0.13%
Maximum risk free interest rate	0.21%
Minimum expected volatility	86.10%
Maximum expected volatility	102.20%
Expected dividend yield	0.00%
Equity-classified \| Valuation Technique, Option Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in units)	722,000
Minimum \| Liability-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected life	2 years 3 months 18 days
Minimum \| Equity-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected life	1 year 10 months 24 days
Maximum \| Liability-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected life	2 years 7 months 6 days
Maximum \| Equity-classified
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected life	3 years

Fair value of liability classified stock options and PSU's.

No definition available.

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- Definition

The number of grants made 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).

+ References

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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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.

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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.

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No definition available.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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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
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