Stock Option Plan (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

Stock option activity under the Company's 2019 Plan is set forth below:

 

	Number of Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2022	1,421,235	$	12.94	7.09	$	483
Granted	73,500	$	3.04
Exercised	(93,335)	$	0.26
Forfeited	(34,450)	$	14.25
Expired	(362,095)	$	17.00
Outstanding, September 30, 2023	1,004,855	$	11.88	6.69	$	286
Vested and expected to vest, September 30, 2023	1,004,855	$	11.88	6.69	$	286
Options exercisable, September 30, 2023	862,667	$	12.37	6.41	$	286

Schedule of Restricted Stock Unit Activity

Restricted stock unit activity under the Company's 2019 Plan is set forth below:

	Number of Shares	Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2022	1,036,208	$	7.28	$	2,487
Awards granted	831,700	$	2.42
Awards released	(159,272)	$	11.63
Awards canceled	(140,524)	$	7.80
Outstanding, September 30, 2023	1,568,112	$	4.21	$	3,795

Schedule of Non-Cash Stock-Based Compensation Expense

Total non-cash stock-based compensation expense recorded related to options granted, restricted stock units granted and stock purchase rights granted under the ESPP in the condensed statements of operations is as follows (in thousands):

 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Costs of revenue	$	45	$	56	$	161	$	159
Selling, general and administrative	792		1,085		2,497		3,406
Research and development	53		165		196		557
Total	$	890	$	1,306	$	2,854	$	4,122