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Share-Based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2023

Dec. 31, 2022

Share-Based Compensation

Summary of options activity

​

​	​	​	​	​	​
​		Number of		Exercise Price
Date	​	Options	​	Per Share
February 2022		12,950	​	$	49.00
March 2022		9,700	​	$	42.40
June 2022		1,425	​	$	24.80
October 2022		12,125	​	$	21.40
December 2022		32,600	​	$	10.20
May 10, 2023		1,425	​	$	5.97
May 19, 2023		115,000	​	$	5.67
​	​	​	​	​	​

​

​	​	​	​	​	​	​	​
​		​		Weighted			​
​	​	​	​	average		​	Weighted
​	​	​	​	exercise		​	average
​	​	Number of	​	price		​	contractual
​	​	shares	​	per share		​	term (years)
Outstanding at December 31, 2021		85,685		$	6.60		5.2
Granted		68,800	​	​	24.40		6.4
Exercised		(3,633)	​	​	1.60		—
Forfeited		—	​	​	—		—
Outstanding at December 31, 2022		150,852	​	​	14.80		5.3
Granted		116,425	​	​	5.67		0.9
Exercised		—	​	​	—		—
Forfeited		(5,275)	​		0.63		—
Outstanding at September 30, 2023		262,002	​	$	10.81		4.6
​	​	​	​	​	​	​	​

​

​	​	​	​	​	​	​	​
​		​		Weighted			​
​	​	​	​	average		​	Weighted
​	​	​	​	exercise		​	average
​	​	Number of	​	price		​	contractual
​	​	shares	​	per share		​	term (years)
Outstanding at December 31, 2020		1,756,279		$	0.25		5.9
Granted		36,393	​	​	3.91		5.5
Exercised		—	​		—		—
Forfeited		(78,979)	​		—		—
Outstanding at December 31, 2021		1,713,693	​	​	0.33		5.2
Granted		1,376,000	​	​	1.22		6.4
Exercised		(72,660)	​		0.08		—
Forfeited		—	​		—		—
Outstanding at December 30, 2022		3,017,033	​	$	0.74		5.3
​	​	​	​	​	​	​	​

Assumptions for estimating the fair value of options

​

​	​	​	​	​
​		Nine months ended September 30,
​		2023		2022
Risk-free interest rate		4.01% - 4.72%	​	1.38% - 2.79%
Expected term (in years)		6.0	​	3.5 - 6.0
Expected volatility		100.6% - 100.8%	​	93.2%
Expected dividend yield		—	​	—
Fair value per share of underlying stock	​	$0.283 - $0.299	​	$1.24 - $2.45
​	​	​	​	​

​

​	​	​	​	​	​	​	​
​	​	Years ended December 31,					​
​		2022			2021		​
Risk-free interest rate		​	1.38% - 4.12	%	​	0.59	%
Expected term (in years)		​	3.5 - 10.0	​	​	6.0	​
Expected volatility		​	93.2	%	​	97.2	%
Expected dividend yield		​	—	​	​	—	​
Fair value per share of underlying stock	​	$	0.51 - $2.45	​	$	3.91	​

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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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