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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Stockholders' Equity Note [Abstract]  
Schedule of Stock Option and Restricted Stock Activity
Stock option and restricted stock activity for the Plans was as follows for the three months ended March 31, 2019:

 
 
 
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)
 
Aggregate intrinsic value
 
Number of
shares
outstanding under the Plans
 
Weighted-
average
grant date
fair value
per share
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2018
57.1

 
1.3

 
$
14.68

 
5.0
 
$
9.1

 
25.0

 
$
18.68

Additional shares authorized
21.2

 

 

 
 
 
 
 

 

Stock options assumed
0.9

 
0.9

 
6.02

 
 
 
 
 

 

Options exercised and RSUs released

 
(0.2
)
 
5.15

 
 
 
 
 
(2.6
)
 
17.42

Options and RSUs canceled
1.5

 

 

 
 
 
 
 
(1.5
)
 
17.19

Shares repurchased for tax withholdings on release of restricted stock
1.0

 

 

 
 
 
 
 

 
17.42

Restricted stock and options granted
(2.5
)
 
0.2

 
22.63

 
 
 
 
 
2.3

 
23.79

Balance at March 31, 2019
79.2

 
2.2

 
$
12.45

 
5.1
 
$
21.7

 
23.2

 
$
19.44

Vested at March 31, 2019
 
 
1.1

 
$
15.71

 
5.1
 
$
7.7

 

 
$

Unvested at March 31, 2019
 
 
1.1

 
$
9.22

 
 
 
$
14.0

 
23.2

 
$
19.44

Schedule of Pre-Tax Intrinsic Value
The following table summarizes information about the pre-tax intrinsic value of options exercised during the three months ended March 31, 2019 and 2018:

 
Three months ended March 31,
 
2019
 
2018
 
 
 
 
Intrinsic value of options exercised
$
3.1

 
$
1.7

Fair Value of Stock Options Assumptions Used
The fair value of stock options assumed were estimated using the following assumptions:

Expected volatility
51.6
%
Expected term (in years)
3.4 - 7.0

Risk-free interest rate
2.42% - 2.51%

Dividend yield
%