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Net Income Per Share Attributable to Common Stockholders
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Income Per Share Attributable to Common Stockholders
NOTE 12.
Net Income Per Share
The computations for basic and diluted net income per share are as follows:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
 
 
(in thousands, except per share data)
Numerator:
 
 
 
 
 
 
Net income
 
$
69,336

 
$
57,304

 
$
40,440

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
Weighted-average shares used in computing net income per share - basic
 
39,075

 
38,876

 
37,443

Effect of potentially dilutive securities:
 
 
 
 
 
 
Common stock options
 
1,807

 
2,401

 
2,262

Restricted stock units
 
463

 
620

 
366

Weighted-average shares used in computing net income per share - diluted
 
$
41,345

 
$
41,897

 
$
40,071

Net income per share:
 
 
 
 
 
 
Basic
 
$
1.77

 
$
1.47

 
$
1.08

Diluted
 
$
1.68

 
$
1.37

 
$
1.01



Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be anti-dilutive are as follows:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
 
 
(in thousands)
Common stock options
 
461

 
177

 
742

Restricted stock units
 
26

 
22

 
71

   Total anti-dilutive shares
 
487

 
199

 
813