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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2020
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
September 30,		Nine Months Ended
September 30,
 2020201920202019
Sales and marketing$734 $534 $2,263 $1,385 
General and administrative2,154 1,714 6,033 4,762 
Research and development4,560 2,787 12,605 8,574 
Total stock-based compensation expense$7,448 $5,035 $20,901 $14,721 

The following table summarizes the components of non-cash stock-based compensation expense (in thousands):
 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2020201920202019
Stock options and assumed options$879 $941 $2,695 $2,836 
Restricted stock units6,531 4,046 18,089 11,746 
Employee stock purchase plan38 48 117 139 
Total stock-based compensation expense$7,448 $5,035 $20,901 $14,721 
Tax benefit from stock-based awards$1,658 $565 $3,846 $4,050 

We granted an aggregate of 2,000 and 143,650 stock options pursuant to our 2015 Equity Incentive Plan, or the 2015 Plan, during the three and nine months ended September 30, 2020, respectively, as compared to an aggregate of 30,000 and 140,500 stock options for the same periods in the prior year. There were 139,225 and 397,416 stock options exercised during the three and nine months ended September 30, 2020, respectively, as compared to 60,043 and 258,668 stock options for the same periods in the prior year. We granted an aggregate of 169,699 and 488,771 restricted stock units during the three and nine months ended September 30, 2020, respectively, as compared to an aggregate of 88,308 and 425,324 restricted stock units for the same periods in the prior year. There were 34,136 and 121,259 restricted stock units that vested during the three and nine months ended September 30, 2020, respectively, as compared to 15,880 and 177,946 restricted stock units vested during the same periods in the prior year.