STOCK-BASED COMPENSATION - Schedule of Fair Value Assumptions (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Stock Options
Assumptions used to calculate the fair value of awards granted
Risk-free interest rate	1.25%
Risk-free interest rate, minimum		0.20%
Risk-free interest rate, maximum		0.35%
Dividend yield	0.00%	0.00%
Expected option term	6 years
Expected stock price volatility, minimum	284.00%
Expected stock price volatility, maximum		80.00%
Stock Options \| Minimum
Assumptions used to calculate the fair value of awards granted
Expected option term		3 years 4 months 24 days
Stock Options \| Maximum
Assumptions used to calculate the fair value of awards granted
Expected option term		5 years
ESPP
Assumptions used to calculate the fair value of awards granted
Risk-free interest rate, minimum		0.09%
Risk-free interest rate, maximum		0.18%
Dividend yield		0.00%
Expected option term		6 months
Expected stock price volatility, minimum		85.80%
Expected stock price volatility, maximum		142.30%

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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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No definition available.

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

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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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- Definition

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

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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