Stockholders' Equity and Stock-based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Summary of Activity under the 2019 Plan

Activity under the Company's equity incentive plans is summarized as follows:

	Shares Available for Grant
Balance, December 31, 2021	947,347
RSUs granted	(95,761)
PSUs granted	(90,658)
Options granted	(207,062)
Stock awards canceled / forfeited / expired	22,568
Options canceled / forfeited / expired	2,072
Balance, March 31, 2022	578,506

	Options Outstanding
	Number of Stock Options Outstanding	Weighted- Average Exercise Price		Weighted Average Remaining Term  (in Years)
Balance, December 31, 2021	287,175	$	25.89	4.92
Options granted	207,062	$	35.34
Options exercised	(7,459)	$	20.24
Options canceled / forfeited / expired	(2,072)	$	32.87
Balance, March 31, 2022	484,706	$	29.99	6.88

	Stock Awards Outstanding
	Number of Awards Outstanding	Weighted Average Grant Date Fair Value per Share
Balance, December 31, 2021	1,032,904	$	35.00
RSUs granted	95,761	$	39.53
PSUs granted	90,658	$	34.16
Awards released	(190,967)	$	28.04
Stock awards canceled / forfeited / expired	(21,081)	$	40.00
Balance, March 31, 2022	1,007,275	$	36.57

Summary of Stock-based Compensation Expense

Stock-based compensation expense by department recognized during the three months ended March 31, 2022 and 2021 was as follows (in thousands):

	Three Months Ended March 31,
	2022		2021
Cost of revenue	$	459	$	144
Sales and marketing	576		721
Research and development	980		301
General and administrative	2,028		680
Total stock-based compensation expense	$	4,043	$	1,846