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Equity Incentive Plans and Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of shares available for grant
A summary of shares available for grant under the Company’s plans is as follows:
 
Shares Available
 for Grant
Shares available as of December 31, 2019
6,826,863

Stock options granted
—

Stock options forfeited
57,586

Nonvested equity stock and stock units granted (1) (2)
(3,133,386
)
Nonvested equity stock and stock units forfeited (1)
675,987

Total available for grant as of March 31, 2020
4,427,050

_________________________________________
(1)
For purposes of determining the number of shares available for grant under the 2015 Equity Incentive Plan (the “2015 Plan”) against the maximum number of shares authorized, each share of restricted stock granted reduces the number of shares available for grant by 1.5 shares and each share of restricted stock forfeited increases shares available for grant by 1.5 shares.
(2)
Amount includes approximately 0.5 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 2020 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
Schedule of stock option activity
The following table summarizes stock option activity under the 2015 Plan for the three months ended March 31, 2020 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of March 31, 2020.
 
Options Outstanding
 
 
 
 
 
Number of
 Shares
 
Weighted
 Average
 Exercise Price
 Per Share
 
Weighted
 Average
 Remaining
 Contractual
 Term (years)
 
Aggregate
 Intrinsic
 Value
 
(In thousands, except per share amounts)
Outstanding as of December 31, 2019
1,639,146

 
$
11.37

 
 
 
 

Options granted
—

 
$
—

 
 
 
 

Options exercised
(387,662
)
 
$
10.34

 
 
 
 

Options forfeited
(57,586
)
 
$
18.71

 
 
 
 

Outstanding as of March 31, 2020
1,193,898

 
$
11.35

 
5.05
 
$
1,393

Vested or expected to vest at March 31, 2020
1,190,813

 
$
11.34

 
5.04
 
$
1,393

Options exercisable at March 31, 2020
942,307

 
$
10.93

 
4.21
 
$
1,393
Schedule of nonvested equity stock and stock units activity
The following table reflects the activity related to nonvested equity stock and stock units for the three months ended March 31, 2020:
Nonvested Equity Stock and Stock Units
 
Shares
 
Weighted-
 Average
 Grant-Date
 Fair Value
Nonvested at December 31, 2019
 
5,289,483

 
$
11.27

Granted
 
1,722,774

 
$
16.02

Vested
 
(1,192,626
)
 
$
11.31

Forfeited
 
(346,640
)
 
$
11.39

Nonvested at March 31, 2020
 
5,472,991

 
$
12.76