STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE - Assumptions Used to Value Employees Stock Purchase Rights (Details)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Stockholders Equity And Share Based Compensation Expense [Abstract]
Risk free interest rate	0.23%	0.07%
Expected dividend yield	0.00%	0.00%
Expected volatility	58.00%	72.00%
Expected term (in years)	8 months 27 days	9 months

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 for ESPP.

No definition available.

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