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NET LOSS PER SHARE - Narrative (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 2,063 1,568 2,063 1,568