Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2022

Equity Incentive Plans

Summary of the Option Award Activity

The following table summarizes the option activity for the years ended December 31, 2022 and 2021:

							Options Outstanding
											Weighted-
	Shares						Weighted		Weighted-		Average		Aggregate
	Available						Average		Average		Remaining		Intrinsic
	For			Number of			Exercise		Grant Date		Contractual Life		Value
	Grant			Options			Price		Fair Value		(in years)		(in thousands)
Balances, January 1, 2021		157,321			799,470		$	0.41	$	0.18		7.88	$	505
Shares reserved for issuance		937,500			—
Reserved shares cancelled		(182,842	)		—
Options granted		(280,250	)		280,250		$	4.06	$	1.95
Options forfeited / cancelled		25,784			(25,784	)	$	0.40	$	0.18
Options expired		49,737			(49,737	)	$	0.71	$	0.31
Options exercised		—			(396,979	)	$	0.15	$	0.07
Balances, December 31, 2021		707,250			607,220		$	2.23	$	1.06		8.56	$	1,163
Shares reserved for issuance		485,761			—
Reserved shares cancelled		—			—
Options granted		(736,630	)		736,630		$	1.71	$	1.01
Options forfeited / cancelled		—			(18,750	)	$	1.00	$	0.44
Options expired		—			—		$	—	$	—
Options exercised		—			(56,250	)	$	1.00	$	0.44
Balances, December 31, 2022		456,381			1,268,850		$	2.00	$	1.06		7.77	$	62
At December 31, 2022
Vested and exercisable					357,215		$	1.73		0.80		7.08	$	62

Summary of Non-vested Restricted Common Stock Awards Issued to Employees

The following table sets forth the status of the Company’s non-vested restricted common stock awards issued to employees:

	Number of Shares			Weighted- Average Grant-Date Fair Value Per Share
Non-vested as of January 1, 2021		—		$	—
Issuance of restricted common stock		112,500		$	0.36
Vested		(11,719	)	$	0.36
Non-vested as of December 31, 2021		100,781		$	0.36
Vested		(7,031	)	$	0.36
Cancelled		(93,750	)	$	0.36
Non-vested as of December 31, 2022		—		$	—

Summary of Fair Value of Share-Based Payment Awards Estimated on Date of Grant using Assumptions

The fair value of share-based payment awards was estimated on the date of grant using the following assumptions:

	2022			2021
Expected life (in years)	3.58 – 6.08			5.50 – 6.08
Expected volatility	49.86% - 114.76%			49.60% - 51.57%
Risk-free interest rate	0.99% - 3.85%			1.07% - 1.33%
Dividend yield		—	%		—	%

Summary of Total Stock-based Compensation Expense Recorded Related to Share-based Payment Awards

Total stock-based compensation expense recorded related to share-based payment awards was allocated to research and development, sales and marketing, and general and administrative expense as follows (in thousands):

	2022		2021
Research and development	$	114	$	6
Sales and marketing		4		1
General and administrative		280		50
Total stock-based compensation	$	398	$	57