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Compensation Related Costs, Share Based Payments (Policies)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement
The following table summarizes stock-based compensation expense included in the Condensed Consolidated Statements of Operations:
Three months ended September 30,Nine months ended September 30,
(in thousands)
2021202020212020
Cost of revenue
$483 $340 $1,420 $1,175 
Research and development
4,380 3,597 13,131 9,682 
Sales and marketing
1,950 1,601 5,968 4,107 
General and administrative
2,516 2,875 7,708 6,962 
Total stock-based compensation expense
$9,329 $8,413 $28,227 $21,926