7. Net Income Per Share Available to Common Stock

The following table sets forth the computation of our basic and diluted net income per share available to common stock (in thousands, except per share amounts):



	Three Months Ended March 31,
	2018			2017
Numerator:
Basic:
Net income	$	144,538		$	82,961
Less: undistributed earnings allocated to participating securities	(89		)	(267		)
Net income available to common stockholders, basic	$	144,449		$	82,694
Diluted:
Net income attributable to common stockholders, basic	$	144,449		$	82,694
Add: undistributed earnings allocated to participating securities	7			22
Net income attributable to common stockholders, diluted	$	144,456		$	82,716
Denominator:
Basic:
Weighted-average shares used in computing net income per share available to common stockholders, basic	73,994			71,114
Diluted:
Weighted-average shares used in computing net income per share available to common stockholders, basic	73,994			71,114
Add weighted-average effect of dilutive securities:
Stock options and RSUs	6,670			6,321
Employee stock purchase plan	57			81
Weighted-average shares used in computing net income per share available to common stockholders, diluted	80,721			77,516
Net income per share attributable to common stockholders:
Basic	$	1.95		$	1.16
Diluted	$	1.79		$	1.07

The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net income per share available to common stockholders for the periods presented because including them would have been anti-dilutive (in thousands):



	Three Months Ended March 31,
	2018	2017
Stock options and RSUs to purchase common stock	22	188
Employee stock purchase plan	26	—
Total	48	188