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Stock Options (Tables)

12 Months Ended

Dec. 31, 2024

Stock Options

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​
​		Option		Weighted-Average		​	Weighted-Average
​	​	Number of	​	Exercise		​	Remaining
​		Shares		Price Per Share			Contractual Term
Options outstanding at January 1, 2023		4,851,666	​	$	1.91	​	​	8.4
Granted		113,500	​	$	2.19	​	​	—
Exercised		—	​	​	—	​	​	—
Canceled		(60,900)	​	$	0.78	​	​	—
Options outstanding at December 31, 2023		4,904,266	​	$	1.93	​	​	7.5
Granted	​	973,000	​	$	2.09	​	​	—
Exercised	​	—	​	​	—	​	​	—
Canceled	​	(886,439)	​	$	3.36	​	​	—
Options outstanding at December 31, 2024	​	4,990,827	​	$	1.71	​	​	7.0
Options exercisable at December 31, 2024		2,894,417	​	$	1.58	​	​	5.8

Summery of Stock-based compensation included in research and development, marketing and advertising, and general and administrative expenses

Stock-based compensation included in research and development, marketing and advertising, and general and administrative expenses was as follows for the years ended December 31, 2024 and 2023 (in thousands):

​	​	​	​	​	​	​
​		2024			2023
Research and development	​	$	701	​	$	847
Marketing and advertising	​		12	​		18
General and administrative	​		460	​		694
Total stock-based compensation expense	​	$	1,173	​	$	1,559

Schedule of grant date fair value black scholes valuation assumptions

​

​	​	​	​	​	​
​		2024		2023
Expected term		6.83	years	6.72	years
Volatility		26.31	%	26.05	%
Dividend rate		0.0	%	0.0	%
Discount rate		4.32	%	3.56	%

​

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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