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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Numerator for basic and diluted loss per share |  |  |  |
Net income (loss) | $ 2,564 | $ (19,743) | $ (8,116) | $ (39,609)
Denominator |  |  |  |
Weighted average common shares outstanding (in shares) | 40,796 | 40,160 | 40,751 | 39,079
Computation of diluted securities: |  |  |  |
Dilutive effect of stock options (in shares) | 807 | 0 | 0 | 0
Dilutive effect of RSUs (in shares) | 87 | 0 | 0 | 0
Dilutive effect of ESPP purchase options (in shares) | 4 | 0 | 0 | 0
Weighted average common shares outstanding—diluted (in shares) | 41,694 | 40,160 | 40,751 | 39,079
Net loss per share: |  |  |  |
Basic and diluted net income (loss) per common share (in USD per share) | $ 0.06 | $ (0.49) | $ (0.20) | $ (1.01)

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