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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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
188,403

 
51.12

 

 


Forfeited
—

 
—

 

 


Exercised
(6,223
)
 
11.45

 

 


Outstanding as of March 31, 2020
2,873,239

 
$
24.56

 
5.7
 
$
54,796

Exercisable as of March 31, 2020
1,981,650

 
$
13.52

 
4.4
 
$
52,408

Expected to vest as of March 31, 2020
827,468

 
$
49.10

 
8.6
 
$
2,216


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 March 31, 2020
30,000

 
$
21.45

 
6.8
 
$
512

Exercisable as of March 31, 2020
30,000

 
$
21.45

 
6.8
 
$
512
Summary of certain additional information with respect to options
The table below summarizes certain additional information with respect to our options:
 
 
Three Months Ended
 
 
March 31,
(in thousands, except per option amounts)
2020
 
2019
Aggregate intrinsic value of options exercised
$
194

 
$
16,059

Cash received from the exercise of stock options
71

 
2,923

Weighted average grant date fair value per option
$
28.51

 
$
42.35
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
77,214

 
51.18

 
51,839

 
60.36

Forfeited
(1,500
)
 
39.94

 
—

 
—

Vested
(77,260
)
 
26.71

 
—

 
—

Units outstanding as of March 31, 2020
268,506

 
$
48.75

 
141,859

 
$
57.00
Schedule of aggregate market values of RSUs vested
Additional information about our RSUs is summarized as follows:
 
 
Three Months Ended
 
 
March 31,
(in thousands)
2020
 
2019
Aggregate market value of RSUs vested
$
4,135

 
$
11,554
Schedule of aggregate stock-based compensation expense
Our aggregate stock-based compensation expense is summarized as follows:
 
Three Months Ended
 
March 31,
(in thousands)
2020
 
2019
Stock options
$
2,674

 
$
1,459

Restricted stock units
1,307

 
919

Performance stock units
(831
)
 
(81
)
Employee stock purchase plan
232

 
252

Total stock-based compensation expense
$
3,382

 
$
2,549