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STOCKHOLDERS' EQUITY, STOCK-BASED COMPENSATION AND NET LOSS PER SHARE - Weighted Average Assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Note [Abstract]    
Expected term in years 6 years 6 years
Expected volatility 50.00% 51.30%
Expected dividends 0.00% 0.00%
Risk-free interest rate 2.00% 1.59%