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COMMON STOCK AND STOCK INCENTIVE PLANS - Dividend Yield, Black-Scholes Assumptions and Unrecognized Compensation Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Black-Scholes option pricing model with the assumptions
Expected term in years			4 years 9 months
Weighted average risk-free interest rate			1.30%
Expected dividend rate			0.00%
Volatility			51.60%
Unrecognized compensation cost related to unvested stock options and restricted stock and restricted stock units
Unrecognized compensation cost	$ 2.0	$ 0.8
Expected weighted-average period of unrecognized cost	1 year 10 months 13 days	1 year 2 months 23 days

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
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-Topic 718
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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