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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Stock-Based Compensation

Schedule of Stock option plans

​

​	​	​	​	​	​	​
​	​	2014	​	2023	​	​
​		Plan		Plan		Total
Outstanding or Exercised as of December 31, 2021		11,184,450		—		11,184,450
Available for future issuance under plan		1,550,004		—		1,550,004
Total authorized by plan		12,734,454		—		12,734,454
​	​	​	​	​	​	​
Outstanding or Exercised as of December 31, 2022		11,168,061		—		11,168,061
Available for future issuance under plan		1,495,760		—		1,495,760
Totals authorized by plan		12,663,821		—		12,663,821
​	​	​	​	​	​	​
Outstanding or Exercised as of December 31, 2023		—		8,791,833		8,791,833
Available for future issuance under plan		—		3,849,804		3,849,804
Totals authorized by plan		—		12,641,637		12,641,637

Schedule of summary of stock option activity

​

​	​	​	​	​	​	​	​
​	​	​	​	Weighted		​	Average
​	​	Number of	​	Average		​	Remaining Life
​		Options		Exercise Price			(years)
Outstanding at December 31,  2020		2,633,175	​	$	3.09		6.53
Granted		1,100,500	​		17.23
Exercised		(739,956)	​		3.36
Expired or Forfeited	​	(170,085)	​	​	8.58	​	​
Outstanding at December 31,  2021		2,823,634	​	$	7.67		7.95
Granted		442,000	​		5.45
Exercised		(145,185)	​		2.56
Expired or Forfeited		(314,776)	​		9.27
Outstanding at December 31, 2022		2,805,673	​	$	7.80		7.28
Granted		180,000	​		4.43
Exercised		(28,240)	​		1.33
Expired or Forfeited		(46,125)	​		11.33
​	​	​	​	​	​	​	​
Outstanding at December 31, 2023		2,911,308	​	$	7.60		6.30

Summary of assumptions used to compute the fair value of stock options granted

​

​	​	​	​	​	​	​	​	​	​	​
December 31,		2023			2022			2021
Assumptions for Black-Scholes:		​			​			​		​
Expected term in years		​	6.0 to 6.1		​	6.1		​	6.1 to 6.5	​
Volatility		​	86.97% to 88.42	%	​	85.44% to 87.09	%	​	82.8% to 86.0	%
Risk-free interest rate		​	3.58% to 4.43	%	​	2.18% to 3.95	%	​	0.96% to 1.25	%
Expected annual dividends		​	None		​	None		​	None	​
Value of options granted:		​			​			​		​
Number of options granted		​	180,000		​	442,000		​	1,100,500	​
Weighted average fair value per share		$	3.34		$	4.04		$	12.40	​
Fair value of options granted		$	600,345		$	1,783,710		$	13,642,976	​

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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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Tabular disclosure of various program within a company whereby employees are allowed to buy a specific number of stock options in the company for a specified amount of time.

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