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NET INCOME (LOSS) PER SHARE
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
NET INCOME (LOSS) PER SHARE
Potential common shares are excluded from the diluted net income (loss) per share computation to the extent that they would be antidilutive. Because the Company reported a net loss for the years ended December 31, 2017 and 2016, no potentially dilutive securities have been included in the computation of diluted net loss per share for those periods. As discussed in Note 8, Debt, the Company has either the obligation or the option to pay cash for the aggregate principal amount due upon the conversion of its convertible senior notes. Since it is the Company’s intent to settle the principal amount of its convertible senior notes in cash, the potentially dilutive effect of such notes on net income (loss) per share is computed under the treasury stock method.
The following table sets forth the computation of basic and diluted net income (loss) per share for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income (loss)
$
(42,611
)
 
$
(37,949
)
 
$
1,856

Denominator:
 
 
 
 
 
Weighted average common shares outstanding—basic
39,806

 
37,236

 
36,540

Computation of diluted securities:
 
 
 
 
 
Dilutive effect of stock options
—

 
—

 
1,638

Dilutive effect of RSUs
—

 
—

 
3

Dilutive effect of conversion premium on the 2019 Notes
—

 
—

 
3,113

Dilutive effect of warrants
—

 
—

 
6

Dilutive effect of ESPP purchase options
—

 
—

 
1

Weighted average common shares outstanding—diluted
39,806

 
37,236

 
41,301

Net income (loss) per share:
 
 
 
 
 
Basic net income (loss) per common share
$
(1.07
)
 
$
(1.02
)
 
$
0.05

Diluted net income (loss) per common share
$
(1.07
)
 
$
(1.02
)
 
$
0.04


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,
 
2017
 
2016
 
2015
Weighted average number of stock options
5,171

 
4,482

 
1,891

Weighted average number of RSUs
449

 
290

 
99

Conversion premium on the 2019 Notes
411

 
2,022

 
—

Weighted average number of warrants
—

 
1

 
—

Weighted average ESPP purchase options
29

 
21

 
8

     Total
6,060

 
6,816

 
1,998