XML 44 R15.htm IDEA: XBRL DOCUMENT v3.20.1
Stock-Based Compensation
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation
7. Stock-Based Compensation

The following table summarizes our stock-based compensation expense (including stock options, restricted stock units ("RSUs") and performance stock units ("PSUs")) for the three months ended March 31, 2020 and 2019:


Three Months Ended March 31,
(in millions)
2020
 
2019
Stock option compensation expense
$
0.8

 
$
0.5

RSU compensation expense
1.0

 
1.0

PSU compensation expense
(0.9
)
 
0.5

Total stock-based compensation expense
$
0.9

 
$
2.0



We generally recognize compensation expense for stock-based awards ratably over the vesting period. During the first quarter of 2020, the Company's Board of Directors approved stock compensation grants which consisted of 1,402,829 stock options, 600,014 RSUs and 918,911 PSUs.

The following table summarizes our unrecognized compensation expense and the weighted-average period over which the expense will be recognized as of March 31, 2020:

March 31, 2020

Unrecognized
 
Weighted Average

Compensation
 
Years Expense To Be
(in millions, except weighted average years)
Expense
 
Recognized Over
Stock options
$6.9
 
2.4
RSUs
$9.3
 
2.3
PSUs
$3.2
 
2.5