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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of stock option and PSO activity
Stock option and PSO activity is summarized as follows:
Stock Options
Number of
Stock Options
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term
(Years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding as of December 31, 2019
2,691,059

 
$
22.67

 

 


Granted
253,403

 
47.93

 

 


Forfeited
(9,874
)
 
55.59

 

 


Exercised
(36,926
)
 
23.31

 

 


Outstanding as of June 30, 2020
2,897,662

 
$
24.76

 
5.6
 
$
69,702

Exercisable as of June 30, 2020
1,992,447

 
$
13.69

 
4.2
 
$
65,132

Expected to vest as of June 30, 2020
840,114

 
$
49.12

 
8.5
 
$
4,242


Performance Stock Options
Number of
PSOs
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term
(Years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding as of December 31, 2019
30,000

 
$
21.45

 
 
 
 
Granted
—

 
—

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Outstanding as of June 30, 2020
30,000

 
$
21.45

 
6.5
 
$
712

Exercisable as of June 30, 2020
30,000

 
$
21.45

 
6.5
 
$
712
Summary of certain additional information with respect to options
The table below summarizes certain additional information with respect to our options:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
(in thousands, except per option amounts)
2020
 
2019
 
2020
 
2019
Aggregate intrinsic value of options exercised
$
648

 
$
864

 
$
842

 
$
16,923

Cash received from the exercise of stock options
789

 
418

 
860

 
3,341

Weighted average grant date fair value per option
$
20.99

 
$
30.24

 
$
26.58

 
$
40.76
Summary of RSU and PSU activity
RSU and PSU activity is summarized as follows:
 
Restricted Stock Units
 
Performance Stock Units
 
Number
of RSUs
 
Weighted Average
Grant Date Fair
Value
 
Number
of PSUs
 
Weighted Average
Grant Date Fair
Value
Units outstanding as of December 31, 2019
270,052

 
$
41.70

 
90,020

 
$
55.06

Granted
140,747

 
47.30

 
51,839

 
60.36

Forfeited
(2,061
)
 
42.64

 
(561
)
 
56.57

Vested
(114,078
)
 
32.90

 
—

 
—

Units outstanding as of June 30, 2020
294,660

 
$
47.78

 
141,298

 
$
57.00
Schedule of aggregate market values of RSUs vested
Additional information about our RSUs is summarized as follows:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
(in thousands)
2020
 
2019
 
2020
 
2019
Aggregate market value of RSUs vested
$
1,556

 
$
1,279

 
$
5,691

 
$
12,833
Schedule of aggregate stock-based compensation expense
Our aggregate stock-based compensation expense is summarized as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(in thousands)
2020
 
2019
 
2020
 
2019
Stock options
$
2,041

 
$
1,820

 
$
4,715

 
$
3,279

Restricted stock units
1,296

 
1,074

 
2,603

 
1,993

Performance stock units
70

 
152

 
(761
)
 
71

Employee stock purchase plan
271

 
431

 
503

 
683

Total stock-based compensation expense
$
3,678

 
$
3,477

 
$
7,060

 
$
6,026