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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Convertible Preferred Stock
The authorized, issued and outstanding shares of convertible preferred stock and liquidation preferences as of December 31, 2017 were as follows:
 
Shares
 
Per share
price at
issuance
 
Aggregate
liquidation
 
preference
 
Dividend
per share
 
amount
 
Authorized
 
Outstanding
 
Series A
63.9
 
63.9
 
$
0.09

 
$
6.0

 
$
0.02

Series A-1
52.0
 
51.9
 
0.03

 
1.3

 
0.02

Series B
19.5
 
19.5
 
13.58

 
264.8

 
1.08

Series C
15.8
 
12.3
 
$
28.65

 
352.6

 
$
2.30

 
151.2
 
147.6
 
 
 
$
624.7

 
 
Schedule of Stock Option and Restricted Stock Activity
Stock option and restricted stock activity for the Plans was as follows for the years ended December 31, 2018, 2017, and 2016:
 
 
 
 
Options outstanding
 
Restricted stock
outstanding
 
Number of
shares
available for
issuance
under the
Plans
 
Number of
shares
outstanding
under the
Plans
 
Weighted-
average
exercise
price
per share
 
Weighted-
average
remaining
contractual
term
(In years)
 
Number of
Plan
shares
outstanding
 
Weighted-
average
grant date
fair value
per share
Balance at December 31, 2015
14.6

 
13.4

 
$
17.51

 
8.1
 
43.5

 
$
17.67

Options and RSUs canceled
14.1

 
(8.0
)
 
22.04

 
 
 
(6.1
)
 
20.06

Restricted stock granted
(16.6
)
 

 

 
 
 
16.6

 
15.59

Balance at December 31, 2016
12.1

 
5.4

 
$
10.68

 
6.5
 
54.0

 
$
16.41

Additional shares authorized
6.7

 

 

 
 
 

 

Options exercised and RSUs released

 
(0.1
)
 
6.00

 
 
 
(14.6
)
 
17.12

Options and RSUs canceled
6.2

 
(0.3
)
 
17.44

 
 
 
(6.0
)
 
17.96

Shares repurchased for tax withholdings on release of restricted stock
5.5

 

 

 
 
 

 
17.09

Restricted stock granted
(21.5
)
 

 

 
 
 
21.5

 
15.70

Balance at December 31, 2017
9.0

 
5.0

 
$
10.52

 
5.5
 
54.9

 
$
15.60

Reserved for issuance under the 2018 Plan
41.4

 

 
$

 
 
 

 
$

Additional shares authorized
1.3

 

 
$

 
 
 

 
$

Options exercised and RSUs released

 
(3.4
)
 
$
7.75

 
 
 
(40.4
)
 
$
15.42

Options and RSUs canceled
6.0

 
(0.3
)
 
$
22.90

 
 
 
(5.7
)
 
$
16.78

Shares repurchased for tax withholdings on release of restricted stock
15.6

 

 
$

 
 
 

 
$
15.45

Restricted stock granted
(16.2
)
 

 
$

 
 
 
16.2

 
$
20.26

Balance at December 31, 2018
57.1

 
1.3

 
$
14.68

 
5.0
 
25.0

 
$
18.68

Vested at December 31, 2018
 
 
1.3

 
$
14.68

 
 
 

 
$

Unvested at December 31, 2018
 
 

 
$

 
 
 
25.0

 
$
18.68

Schedule of Pre-Tax Intrinsic Value
The following table summarizes information about the pre-tax intrinsic value of options exercised and the weighted-average grant date fair value per share of options granted during the years ended December 31, 2018, 2017, and 2016:
 
 
 
Year ended
December 31,
 
 
2018

2017

2016
Intrinsic value of options exercised
 
$
59.0

 
$
1.2

 
$