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NET INCOME (LOSS) PER SHARE (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017 and 2016 (in thousands, except per share amounts):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
   Net loss
$
(7,597
)
 
$
(22,164
)
 
$
(47,206
)
 
$
(33,977
)
Denominator:
 
 
 
 
 
 
 
   Weighted average common shares outstanding
40,463

 
37,312

 
39,540

 
37,171

Net loss per share:
 
 
 
 
 
 
 
   Basic and diluted net loss per common share
$
(0.19
)
 
$
(0.59
)
 
$
(1.19
)
 
$
(0.91
)
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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Weighted average number of stock options
5,405

 
4,632

 
5,203

 
4,403

Weighted average number of RSUs
549

 
372

 
426

 
265

Conversion premium on the 2019 Notes
5

 
1,750

 
546

 
2,288

Weighted average number of warrants
—

 
—

 
—

 
1

Weighted average ESPP purchase options
22

 
20

 
32

 
22

      Total
5,981

 
6,774

 
6,207

 
6,979