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NET INCOME (LOSS) PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Reconciliation used in Computing Basic and Diluted Net Income (Loss) per Share
The following is a reconciliation of the numerators and denominators used in computing basic and diluted net loss per share for both continuing and discontinued operations:
 
 
Three months ended March 31,
 
 
2018
 
2017
 
 
(in thousands, except
per share amounts)
Numerator:
 
 
 
 
Net income (loss)
 
$
69,883

 
$
(12,865
)
Denominator:
 
 
 
 
Shares used in computation of basic net income (loss) per share (weighted average common shares outstanding)
 
29,700

 
29,024

Dilutive potential common shares:
 
 
 
 
Stock options, ESPP, restricted Stock and RSUs
 
866

 
—

Shares used in computation of diluted net income (loss) per share
 
30,566

 
29,024

Basic net income (loss) per share
 
$
2.35

 
$
(0.44
)
Diluted net income (loss) per share
 
$
2.29

 
$
(0.44
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
These outstanding securities consisted of the following:
 
 
March 31, 2017
Standard and market condition stock options outstanding
 
3,616,995

Restricted stock awards outstanding
 
77,540

RSUs outstanding
 
403,935

ESPP
 
11,889