2. NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share attributable to Innoviva stockholders is computed by dividing net income (loss) attributable to Innoviva stockholder by the weighted-average number of shares of common stock outstanding. Diluted net income (loss) per share attributable to Innoviva stockholders is computed by dividing net income (loss) attributable to Innoviva stockholders by the weighted-average number of shares of common stock and dilutive potential common stock equivalents then outstanding. Dilutive potential common stock equivalents include the assumed exercise, vesting and issuance of employee stock awards using the treasury stock method, as well as common stock issuable upon assumed conversion of our 2023 convertible debt using the if-converted method.

Our 2025 Notes are convertible, based on the applicable conversion rate, into cash, shares of our common stock or a combination thereof, at our election. Our current intent is to settle the principal amount of the 2025 Notes in cash upon conversion. The impact of the assumed conversion premium to diluted net income per share is computed using the treasury stock method. As the average market price per share of our common stock as reported on The Nasdaq Global Select Market was lower than the initial conversion price of $17.26 per share, there was no dilutive effect of the assumed conversion premium for the year ended December 31, 2017.

The following table shows the computation of basic and diluted net income (loss) per share for the years ended December 31, 2017, 2016 and 2015:

	Year Ended December 31,
(In thousands except per share data)	2017		2016		2015
Numerator:
Net income (loss) attributable to Innoviva stockholders, basic	$	134,143	$	59,536	$	(18,760	)
Add: interest expense on 2023 Notes		5,647		5,790		—

Net income (loss) attributable to Innoviva stockholders, diluted	$	139,790	$	65,326	$	(18,760	)


Denominator:
Weighted-average shares used to compute basic net income (loss) per share attributable to Innoviva stockholders		106,945		110,280		115,372
Dilutive effect of 2023 Notes		12,189		12,541		—
Dilutive effect of options and awards granted under equity incentive plan and employee stock purchase plan		732		412		—

Weighted-average shares used to compute diluted net income (loss) per share attributable to Innoviva stockholders		119,866		123,233		115,372


Net income (loss) per share attributable to Innoviva stockholders
Basic	$	1.25	$	0.54	$	(0.16	)


Diluted	$	1.17	$	0.53	$	(0.16	)

Anti-dilutive Securities

The following common share equivalents were not included in the computation of diluted net income (loss) per share because their effect was anti-dilutive:

	Year Ended December 31,
(In thousands)	2017		2016		2015
Outstanding options and awards granted under equity incentive plan and employee stock purchase plan		2,121		4,073		6,934
Shares issuable upon conversion of 2023 Notes		—		—		12,904

		2,121		4,073		19,838