Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense for Options Granted Reflected in the Consolidate Statement of Operations and Comprehensive Loss

Stock-based compensation expense for stock options and RSUs is reflected in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2023		2022		2023		2022
General and administrative	$	1,639	$	2,057	$	5,578	$	5,769
Research and development	535		438		1,917		2,104
Total	$	2,174	$	2,495	$	7,495	$	7,873

Schedule of Company's Stock Option Activity

The following table summarizes the Company's stock option activity:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Stock options outstanding at December 31, 2022	10,851,287	$	2.95	8.3	$	1,385
Granted	4,850,889	$	1.06
Exercised	(240,000)	$	0.41
Forfeited	(1,886,138)	$	2.25
Stock options outstanding at September 30, 2023	13,576,038	$	2.42	8.1	$	51
Stock options exercisable at September 30, 2023	6,589,323	$	2.72	7.4	$	51

Schedule of RSU Activity

The following table summarizes the Company's RSU activity:

	Number of Shares	Weighted Average Grant Date Fair Value
RSUs outstanding at December 31, 2022	924,810	$	4.12
Granted	3,186,442	$	1.20
Vested	(264,195)	$	4.41
Forfeited	(813,729)	$	1.56
RSUs outstanding at September 30, 2023	3,033,328	$	1.72