Stock-Based Compensation

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

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,
	2020		2019		2020		2019
Sales and marketing	$	772	$	471	$	1,529	$	851
General and administrative	2,097		1,781		3,879		3,048
Research and development	4,226		3,168		8,045		5,787
Total stock-based compensation expense	$	7,095	$	5,420	$	13,453	$	9,686

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,
	2020		2019		2020		2019
Stock options and assumed options	$	1,015	$	1,102	$	1,816	$	1,895
Restricted stock units	6,048		4,271		11,558		7,700

Employee stock purchase plan	32		47		79		91
Total stock-based compensation expense	$	7,095	$	5,420	$	13,453	$	9,686
Tax benefit from stock-based awards	$	1,610	$	2,171	$	2,188	$	3,485

We granted an aggregate of 136,650 and 141,650 stock options pursuant to our 2015 Equity Incentive Plan, or the 2015 Plan, during the three and six months ended June 30, 2020, respectively, as compared to an aggregate of 102,500 and 110,500 stock options for the same periods in the prior year. There were 194,443 and 258,191 stock options exercised during the three and six months ended June 30, 2020, respectively, as compared to 113,159 and 198,625 stock options for the same periods in the prior year. We granted an aggregate of 218,344 and 319,072 restricted stock units during the three and six months ended June 30, 2020, respectively, as compared to an aggregate of 146,766 and 337,016 restricted stock units for the same periods in the prior year. There were 64,075 and 87,123 restricted stock units that vested during the three and six months ended June 30, 2020, respectively, as compared to 118,606 and 162,066 restricted stock units vested during the same periods in the prior year.