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NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator for basic and diluted loss per share |  |  |  |
Net loss | $ (19,743) | $ (7,958) | $ (39,609) | $ (11,812)
Denominator |  |  |  |
Weighted Average Number of Shares Outstanding, Basic (shares) | 40,160 | 37,181 | 39,079 | 37,101
Earnings Per Share, Basic | $ (0.49) | $ (0.21) | $ (1.01) | $ (0.32)

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