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

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule 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, 2022	1,070,925
Additional shares reserved	3,800,000
Options and stock awards granted	(2,048,037)
Stock awards canceled / forfeited / expired	378,128
Options canceled / forfeited / expired	189,705
Balance, September 30, 2023	3,390,721

	Options Outstanding
	Number of Stock Options Outstanding	Weighted- Average Exercise Price		Weighted Average Remaining Term  (in Years)
Balance, December 31, 2022	513,935	$	34.41	6.63
Options granted	1,099,075	$	13.27
Options exercised	(42,234)	$	14.50
Options canceled / forfeited / expired	(189,705)	$	30.26
Balance, September 30, 2023	1,381,071	$	18.77	8.44

	Stock Awards Outstanding
	Number of Awards Outstanding	Weighted Average Grant Date Fair Value per Share
Balance, December 31, 2022	906,211	$	40.39
Stock awards granted	752,492	$	15.72
Awards released	(284,231)	$	35.54
Stock awards canceled / forfeited / expired	(378,128)	$	39.38
Balance, September 30, 2023	996,344	$	23.50

Schedule of Stock-based Compensation Expense

Stock-based compensation expense by financial statement line item recognized during the three and nine months ended September 30, 2023 and 2022 was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Cost of revenue	$	(19)	$	471	$	706	$	1,430
Sales and marketing	593		1,641		3,024		3,855
Research and development	(178)		466		930		2,513
General and administrative	1,220		1,667		1,892		5,223
Total stock-based compensation expense	$	1,616	$	4,245	$	6,552	$	13,021