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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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