Net Income Per Share

Basic net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period adjusted to include the effect of potentially dilutive securities. Potentially dilutive securities are excluded from the computation of dilutive EPS in periods in which the effect would be antidilutive.

The computation of the Company’s basic and diluted net income per share is as follows (in thousands, except per share amounts):



	Years Ended December 31,
	2018		2017		2016
Numerator:
Net income attributable to common stockholders	$	26,657	$	125,489	$	75,129
Denominator:
Weighted average shares used to compute net income per share attributable to common stockholders, basic	110,089		105,432		102,367
Weighted average effect of potentially dilutive shares to purchase common stock	7,023		2,774		2,597
Weighted average shares used to compute net income per share attributable to common stockholders, diluted	117,112		108,206		104,964
Net income per share attributable to common stockholders
Basic	$	0.24	$	1.19	$	0.73
Diluted	$	0.23	$	1.16	$	0.72

The following shares were excluded from the computation of diluted net income per share as the impact of including those shares would be anti-dilutive (in thousands):



	Year Ended December 31,
	2018	2017	2016
Warrants	625	1,251	1,251
Outstanding stock options	3,271	13,803	8,981
Unvested restricted stock units	649	1,451	1,564
Total	4,545	16,505	11,796