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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Additionally, the voluntary conversions of Class B common stock into Class A common stock are included in the table below weighted for the period outstanding in the year ended December 31, 2018:
 
Year ended December 31,
 
2018
 
2017
 
2016
 
Class A
 
Class B
 
Class A
 
Class B
 
Class A
 
Class B
Numerator:
 
 
 
 
 
 
 
 
 
 
 
Net loss attributable to common stockholders
$
(138.7
)
 
$
(346.2
)
 
$
(3.6
)
 
$
(108.1
)
 
$
(6.1
)
 
$
(204.1
)
Denominator:
 
 
 
 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share
102.6

 
256.0

 
6.3

 
189.6

 
5.5

 
183.6

Net loss per common share, basic and diluted
$
(1.35
)
 
$
(1.35
)
 
$
(0.57
)
 
$
(0.57
)
 
$
(1.11
)
 
$
(1.11
)
Schedule of Potentially Dilutive Securities Excluded from Computation of Earnings Per Share
The weighted-average impact of potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:
 
 
Year ended December 31,
 
2018

2017

2016
Convertible preferred stock
—

 
147.6

 
147.6

Restricted stock units
35.0

 
52.7

 
47.9

Options to purchase shares of common stock
4.0

 
5.1

 
7.9

Co-Founder Grants(1)
14.7

 
0.8

 
—

Shares subject to repurchase from early-exercised options and unvested restricted stock
0.1

 
0.2

 
0.9

Total
53.8

 
206.4

 
204.3

 
(1) 
In December 2017, the Board of Directors approved a grant to the Company’s co-founders of non-Plan RSAs with respect to 14.7 million shares of Class A Common Stock. The table above reflects the weighted-average impact for the period they were outstanding for the year ended December 31, 2017. See Note 11 "Stockholders' Equity" for further details.