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NET INCOME (LOSS) PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted loss per share
The following table sets forth the computation of basic and diluted net income (loss) per share for the three and six months ended June 30, 2017 and 2016 (in thousands, except per share amounts):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
   Net loss
$
(19,743
)
 
$
(7,958
)
 
$
(39,609
)
 
$
(11,812
)
Denominator:
 
 
 
 
 
 
 
   Weighted average common shares outstanding
40,160

 
37,181

 
39,079

 
37,101

Net loss per share:
 
 
 
 
 
 
 
   Basic and diluted net loss per common share
$
(0.49
)
 
$
(0.21
)
 
$
(1.01
)
 
$
(0.32
)
Schedule of potential dilutive effect of the securities excluded from the calculation of diluted loss per share
The following outstanding stock options, RSUs, conversion premiums on the Company’s convertible senior notes, warrants and ESPP purchase options are antidilutive in the periods presented (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Weighted average number of stock options
5,092

 
4,254

 
5,102

 
4,288

Weighted average number of RSUs
375

 
218

 
364

 
212

Conversion premium on the 2019 Notes
9

 
2,364

 
817

 
2,557

Weighted average number of warrants
—

 
—

 
—

 
1

Weighted average ESPP purchase options
36

 
—

 
37

 
12

      Total
5,512

 
6,836

 
6,320

 
7,070