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Stock-Based Compensation Plans (Tables)
3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of components of stock compensation expense

The components of stock-based compensation expense were as follows:
 
Three months ended March 31,
 
2020
 
2019
 
(in thousands)
2007 Stock Incentive Plan
$
1,025

 
$
1,259

2018 Stock Incentive Plan
1,060

 

Employee Stock Purchase Plan
32

 
6

Total Stock Compensation Expense
$
2,117

 
$
1,265


Summary of restricted stock activity
The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the three months ended March 31, 2020:
 
Shares
Balance as of December 31, 2019
505,467

Shares granted

Shares forfeited

Shares vested
(60,811
)
Balance as of March 31, 2020
444,656