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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Stock-based compensation expense is included in the following line items in the condensed consolidated statements of operations (in thousands):
 Three Months Ended
March 31,
 20232022
Sales and marketing$1,032 $1,058 
General and administrative3,145 3,235 
Research and development8,509 7,817 
Total stock-based compensation expense$12,686 $12,110 

The following table summarizes the components of non-cash stock-based compensation expense (in thousands):
 Three Months Ended
March 31,
 20232022
Stock options$912 $778 
Restricted stock units11,722 11,284 
Employee stock purchase plan52 48 
Total stock-based compensation expense$12,686 $12,110 
Tax (shortfall) / windfall benefit from stock-based awards$(22)$529 

We granted 21,400 and no stock options pursuant to our 2015 Equity Incentive Plan during the three months ended March 31, 2023 and 2022, respectively. There were 70,951 stock options exercised during the three months ended March 31, 2023, as compared to 14,020 stock options for the same period in the prior year. There was an aggregate of 82,875 restricted stock units without performance conditions granted to certain of our employees during the three months ended March 31, 2023, as compared to an aggregate of 156,543 restricted stock units without performance conditions for the same period in the prior year. There were no restricted stock units with performance conditions granted to certain of our employees during the three months ended March 31, 2023, as compared to 71,934 restricted stock units with performance conditions for the same period in the prior year. There were 167,085 restricted stock units without performance conditions that vested during the three months ended March 31, 2023, as compared to 57,497 restricted stock units without performance conditions vested during the same period in the prior year. There were 9,000 restricted stock units with performance conditions that vested during the three months ended March 31, 2023, as compared to no restricted stock units with performance conditions vested for the same period in the prior year.