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STOCKHOLDERS' EQUITY - Stock Options Assumptions (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares
Stock options
Stock-based compensation
Weighted average grant date fair value of grants	$ 3.36
Assumptions:
Stock price volatility (as a percent)	61.87%
Risk free rate of return (as a percent)	1.21%
Expected term	4 years 9 months
Restricted Stock
Stock-based compensation
Weighted average grant date fair value of grants	$ 6.13
Assumptions:
Stock price volatility (as a percent)	51.79%
Risk free rate of return (as a percent)	1.22%
Expected term	3 years 10 months 24 days

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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.

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

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