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NET INCOME (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
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 years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net loss
$
(471
)
 
$
(42,611
)
 
$
(37,949
)
Denominator:
 
 
 
 
 
Weighted average shares of common stock outstanding
40,911

 
39,806

 
37,236

Net loss per share:
 
 
 
 
 
Basic and diluted net loss per common share
$
(0.01
)
 
$
(1.07
)
 
$
(1.02
)
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):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Weighted average number of stock options
5,492

 
5,171

 
4,482

Weighted average number of RSUs
542

 
449

 
290

Conversion premium on the 2019 Notes
—

 
411

 
2,022

Weighted average number of warrants
—

 
—

 
1

Weighted average ESPP purchase options
31

 
29

 
21

     Total
6,065

 
6,060

 
6,816