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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense and Stock Option Activity
The following table reflects the Company's stock-based compensation expense related to share-based awards for the three and nine months ended September 30, 2019 and 2018:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Unamortized Expense
 
Weighted Average Remaining Expense Period (Years)
($ in thousands)
2019
 
2018
 
2019
 
2018
 
At September 30, 2019
Stock options
$
1,469

 
$
3,957

 
$
4,691

 
$
8,587

 
$
9,225

 
2.5
Restricted stock units
4,714

 
11,835

 
14,851

 
21,734

 
35,926

 
2.0
Employee stock purchase plan
443

 
296

 
1,162

 
884

 
295

 
0.2
Total
$
6,626

 
$
16,088

 
$
20,704

 
$
31,205

 
$
45,446

 
 


The following summarizes stock option activity for the nine months ended September 30, 2019:
 
Number of
Options
 
Weighted Average
Exercise Price
 
Aggregate
Intrinsic
Value (in thousands)
 
Weighted Average
Remaining Contractual Term (Years)
Outstanding at December 31, 2018
3,077,624

 
$
39.16

 
 
 
 
Granted
125,640

 
93.16

 
 
 
 
Exercised
(1,192,397
)
 
34.68

 
$
99,206

 
 
Forfeited / Expired
(124,198
)
 
50.58

 
 
 
 
Outstanding at September 30, 2019
1,886,669

 
$
44.84

 
$
226,571

 
5.6
Vested, September 30, 2019
1,447,398

 
$
38.25

 
$
183,351

 
4.8
Vested or expected to vest, September 30, 2019 (1)
1,835,967

 

 
$
222,101

 
 
(1)Represents total outstanding stock options as of September 30, 2019, adjusted for estimated forfeitures.
Summary of Restricted Stock Units Activity
The following table summarizes activity for the Company’s restricted stock units during the nine months ended September 30, 2019:
 
Number of
Shares
 
Weighted Average
Fair Value
Outstanding at December 31, 2018
752,207

 
$
55.02

Granted
317,212

 
94.68

Vested
(317,481
)
 
45.29

Forfeited
(69,013
)
 
67.34

Outstanding at September 30, 2019
682,925

 
$
76.72