2. Net Income Per Share

Basic net income per share attributable to Innoviva stockholders is computed by dividing net income attributable to Innoviva stockholders by the weighted-average number of shares of common stock outstanding. Diluted net income per share attributable to Innoviva stockholders is computed by dividing net income 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 convertible subordinated notes due 2023 (the “2023 Notes”) using the if-converted method.

Our convertible senior notes due 2025 (the “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 during the relevant periods was lower than the initial conversion price of $17.26 per share, there was no dilutive effect of the assumed conversion premium for the three months ended March 31, 2019.

The following table shows the computation of basic and diluted net income per share for the three months ended March 31, 2019 and 2018:


	Three Months Ended March 31,
(In thousands except per share data)	2019		2018
Numerator:
Net income attributable to Innoviva stockholders, basic	$	33,790	$	29,581
Add: interest expense on 2023 Notes		1,415		1,412
Net income attributable to Innoviva stockholders, diluted	$	35,205	$	30,993

Denominator:
Weighted-average shares used to compute basic net income per share attributable to Innoviva stockholders		101,059		100,604
Dilutive effect of 2023 Notes		12,189		12,189
Dilutive effect of options and awards granted under equity incentive plan and employee stock purchase plan		128		773
Weighted-average shares used to compute diluted net income per share attributable to Innoviva stockholders		113,376		113,566

Net income per share attributable to Innoviva stockholders
Basic	$	0.33	$	0.29
Diluted	$	0.31	$	0.27

Anti-Dilutive Securities

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


	Three Months Ended March 31,
(In thousands)	2019	2018
Outstanding options and awards granted under equity incentive plan and employee stock purchase plan	1,053	1,492