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Stock-Based Compensation | 3 Months Ended
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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, |  |
| 2023 |  | 2022 |  |  |  |
Sales and marketing | $ | 1,032 |  |  | $ | 1,058 |  |  |  |  |
General and administrative | 3,145 |  |  | 3,235 |  |  |  |  |
Research and development | 8,509 |  |  | 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, |  |
| 2023 |  | 2022 |  |  |  |
Stock options | $ | 912 |  |  | $ | 778 |  |  |  |  |
Restricted stock units | 11,722 |  |  | 11,284 |  |  |  |  |
Employee stock purchase plan | 52 |  |  | 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.

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