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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Stock-based compensation expense is included in the following line items in the condensed consolidated statements of operations (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Sales and marketing$1,235 $772 $2,043 $1,529 
General and administrative3,163 2,097 5,243 3,879 
Research and development5,658 4,226 10,658 8,045 
Total stock-based compensation expense$10,056 $7,095 $17,944 $13,453 

The following table summarizes the components of non-cash stock-based compensation expense (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Stock options and assumed options$1,159 $1,015 $1,776 $1,816 
Restricted stock units8,849 6,048 16,073 11,558 
Employee stock purchase plan48 32 95 79 
Total stock-based compensation expense$10,056 $7,095 $17,944 $13,453 
Tax windfall benefit from stock-based awards$3,120 $1,610 $5,680 $2,188