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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense consisted of the following:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Stock options$1,500 $1,775 $5,271 $5,234 
Restricted stock units3,164 3,315 9,216 7,568 
Total$4,664 $5,090 $14,487 $12,802