Equity Incentive Plans and Stock-Based Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of the Company’s stock option activity and related information is as follows (in thousands, except share and per share amounts):

	Outstanding Stock Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Balance as of December 31, 2021		2,215,942		$	4.72		6.9	$	3,959
Granted		2,143,125			3.23		—		—
Exercised		(992	)		1.39		—		—
Forfeited		(403,095	)		7.47		—		—
Balance as of June 30, 2022		3,954,980		$	3.63		8.1	$	410
Vested and expected to vest as of June 30, 2022		3,814,980		$	3.59		8.0	$	410
Vested and exercisable as of June 30, 2022		1,461,195		$	3.57		5.4	$	292

Summary of RSU Activity

A summary of the Company’s RSU activity and related information is as follows:

	RSUs
	Shares			Weight-Average Grant Date Fair Value Per Share
Unvested balance as of December 31, 2021		460,000		$	2.48
Granted		92,200			2.58
Vested		(64,347	)		2.49
Forfeited		(62,000	)		2.55
Unvested balance as of June 30, 2022		425,853		$	2.49

Summary of Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense recognized in the Company’s condensed statements of operations and comprehensive loss during the three and six months ended June 30, 2022 and 2021 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Research and development	$	245	$	346	$	545	$	610
General and administrative		660		664		1,501		1,520
Total stock-based compensation expense	$	905	$	1,010	$	2,046	$	2,130