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Stock-Based Compensation (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Stock-Based Compensation

Summary of stock option activity

Stock options outstanding under the 2024 Plan were as follows (in thousands, except per share amounts and years):

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted		​	​
​	​	​	​	​	​	​	Average	​	​	​
​	​	Number of	​	Weighted-		​	Remaining	​	​	​
​	​	Options	​	Average		​	Contractual Life	​	Aggregated
​	​	Outstanding	​	Exercise Price		​	(in Years)	​	Intrinsic Value
Balance as of December 31, 2023	​	3,579	​	$	0.02	​	5.5	​	$	4,405
Reverse recapitalization	​	(2,911)	​	​	0.09	​	—	​	​	—
Balance as of December 31, 2023(1)	​	668	​	$	0.11	​	5.5	​	​	4,405
Granted	​	—	​	​	—	​	—	​	​	—
Exercised	​	—	​	​	—	​	—	​	​	—
Cancelled	​	—	​	​	—	​	—	​	​	—
Balance as of March 31, 2024		668		​	0.11		5.3		​	5,543
Vested as of March 31, 2024		667	​	$	0.11		5.3		​	5,532
Exercisable as of March 31, 2024		634	​	$	0.11		5.1		​	5,256

(1) Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

​

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	Options Outstanding
​	​	​	​	​	​	​	​	​	​	Weighted
​	​	​	​	Number of		​	​	​	​	Average
​	​	Shares	​	Stock		​	Weighted-		​	Remaining
​	​	Available	​	Options		​	Average		​	Contractual Life
​		for Grant		Outstanding			Exercise Price			(Years)
Balances as of January 1, 2022	​	1,679,763	​	​	8,194,822	​	$	0.02	​	6.1
Granted		(105,000)		​	105,000	​		0.02
Exercised		—		​	(2,459,014)	​		0.02
Cancelled		1,066,916		​	(1,066,916)	​		0.02
Balances as of December 31, 2022		2,641,679		​	4,773,892	​		0.02		5.1
RSUs granted		(2,099,970)		​	—	​		—
Exercised		—		​	(1,130,481)	​		0.02
Cancelled		64,117		​	(64,117)	​		0.02
Balances as of December 31, 2023		605,826		​	3,579,294	​		0.02		5.5
Vested as of December 31, 2023		​	​	​	3,311,859	​	$	0.02	​	5.3
Vested and expected to be vest as of December 31, 2023		​	​	​	3,569,024	​	$	0.02	​	5.5

Summary of assumptions used to calculate fair value of employee stock options

​

​	​	​	​
​		2022
Estimated term (in years)		5.8	​
Risk-free interest rate		1.85	%
Expected volatility		65	%
Expected dividend yield		0	%

Summary of RSUs activity

RSUs outstanding under the 2024 Plan were as follows (in thousands, except per share amounts):

​	​	​	​	​	​
​		​		Weighted
​	​	Number of RSUs	​	Average Grant
​	​	Outstanding	​	Date Fair Value
Balance as of December 31, 2023	​	2,100	​	$	1.15
Reverse recapitalization	​	(1,708)	​	​	5.01
Balances as of December 31, 2023(1)	​	392	​	$	6.16
Granted		—		​	—
Vested		—		​	—
Cancelled		—		​	—
Balance as of March 31, 2024		392	​	$	6.16

(1) Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average Grant
​		Shares		Date Fair Value
Nonvested, outstanding at December 31, 2022		—	​	$	—
Granted		2,099,970	​		1.15
Vested		—	​		—
Cancelled		—	​		—
Nonvested, outstanding at December 31, 2023		2,099,970	​	$	1.15

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