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Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2023

Stock Incentive Plans

Schedule of stock option activity

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​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted	​	​	​
​	​	​	​	Weighted-		​	Average	​	Aggregate
​	​	​	​	Average		​	Remaining	​	Intrinsic
​	​	​	​	Exercise		​	Contractual	​	Value
​		Shares		Price			Term (years)		(in thousands)
Outstanding at December 31, 2022	​	2,253,431	​	$	15.43	​	8.57	​	$	9,733
Granted		1,906,050	​	$	12.01	​	​	​	​	​
Exercised	​	(78,050)	​	$	5.37	​	​	​	​	​
Cancelled or forfeited		(526,939)	​	$	16.80	​	​	​	​	​
Expired	​	(523)	​	$	138.60	​	​	​	​	​
Outstanding at December 31, 2023		3,553,969	​	$	13.59		8.39	​	$	1,912
Vested and exercisable at December 31, 2023		1,107,936	​	$	18.62		7.42	​	$	821
Vested and expected to vest at December 31, 2023	​	3,553,969	​	$	13.59	​	8.39	​	$	1,912

​

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

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​	​	​	​	​
​	​	Year Ended December 31,
​		2023		2022
Weighted-average expected volatility		65.86%-73.68%	​	65.60-70.22%
Expected term (in years)		5.5-6.25	​	5-6.25
Risk-free interest rate		3.42%-4.67%	​	1.48-4.17%
Expected dividend yield		0%	​	0%

​

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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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