Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2025

Equity Incentive Plans [Abstract]

Stock Option Plan Activity

Activity under the stock option plans was as follows:

	Number of options			Weighted average exercise price	Aggregate Intrinsic Value
Outstanding at December 31, 2023	2,102,030		$	2.00
Granted	1,359,821			1.07
Forfeited	(487,632	)		1.84
Outstanding at December 31, 2024	2,974,219		$	1.60	847,758
Granted	1,639,915			1.08
Forfeited	(783,743	)		1.15
Outstanding at December 31, 2025	3,830,391		$	1.47	92,127
Vested and exercisable at December 31, 2025	2,021,208		$	1.87	75,115

Black-Scholes Weighted Average Assumptions

The Black-Scholes weighted-average assumptions for all stock option awards granted during 2025 and 2024 were as follows:

		2025				2024
		2021 Plan		Inducement Grants		2021 Plan		Inducement Grants
Fair Value of Awards	$	0.83		0.69		0.91		0.94
Grant Price	$	1.08		0.9		1.07		1.1
Expected term (in years)		6.04		6.25		6.20		6.25
Risk‑free interest rate		4.34	%	4.03	%	4.04	%	4.10	%
Dividend yield		—	%	—	%	—	%	—	%
Expected volatility		91.17	%	88.50	%	109.61	%	109.64	%

Options Outstanding and Vested and Currently Exercisable by Exercise Prices

The options outstanding and vested and currently exercisable by exercise prices as of December 31, 2025 were as follows:

	Options outstanding			Options vested and exercisable
	Exercise price	Outstanding (in shares)	Weighted average remaining life years	Number of options vested		Weighted average Exercise price	Weighted average remaining life years
$	0.47 -  0.49	1,021,300	6.31	832,500	$	0.49	6.04
	0.50 -  0.80	523,596	7.84	159,381		0.76	6.80
	0.81 -  1.33	1,579,479	8.37	450,359		1.10	6.80
	1.34 -  1.74	204,846	1.06	87,435		1.67	1.62
	1.75 -  3.14	103,550	2.40	93,913		2.59	2.01
	3.15 -  3.60	237,614	1.34	237,614		3.24	1.34
	3.61 - 13.00	160,006	4.73	160,006		9.94	4.73
		3,830,391	6.61	2,021,208		1.87	5.23

Share-based Compensation Expense

The following table shows the stock-based compensation expense related to vested stock option grants to employees and non-employees awarded under the stock plans and inducement grants by financial statement line item on the accompanying statements of comprehensive loss:

	2025		2024
Research and development	$	224,714		179,911
Sales and marketing		52,537		48,379
General and administrative		512,894		215,857
Total share-based compensation expense	$	790,145		444,147

2021 Stock Option Plan [Member]

Equity Incentive Plans [Abstract]

Stock Option Plan Activity

Stock options granted under the 2021 Plan for the years ended December 31, 2025 and 2024 were as follows:

	2025	2024
Employee	1,569,515	1,286,921
Nonemployee	70,400	72,900
Total	1,639,915	1,359,821

Inducement Grants [Member]

Equity Incentive Plans [Abstract]

Stock Option Plan Activity

The inducement grants are summarized as follows:

	Number of options			Weighted average exercise price		Weighted average remaining life years
Outstanding at December 31, 2024		250,000		$	1.89		8.07
Granted		100,000			0.90		10.48
Forfeited		(212,500	)		1.02
Outstanding at December 31, 2025		137,500		$	2.52		4.53
Vested and exercisable at December 31, 2025		112,500		$	2.42		4.17