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Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Number of Options |  |
Outstanding, beginning of period (in shares) | 4,183,232 |
Granted (in shares) | 2,017,596 |
Expired (in shares) | (15,341) |
Cancelled/Forfeited (in shares) | (146,312) |
Outstanding, end of period (in shares) | 6,039,175 | 4,183,232
Exercisable (in shares) | 2,569,497 |
Unvested at March 31, 2024 (in shares) | 3,469,678 |
Weighted Average Exercise Price Per Share |  |
Outstanding, Weighted Average Exercise Price Per Share, beginning of period (in dollars per share) | $ 8.17 |
Granted, Weighted Average Exercise Price Per Share (in dollars per share) | 4.80 |
Expired, Weighted Average Exercise Price Per Share (in dollars per share) | 7.16 |
Cancelled-Forfeited, Weighted Average Exercise Price Per Share (in dollars per share) | 6.08 |
Outstanding, Weighted Average Exercise Price Per Share, end of period (in dollars per share) | 7.10 | $ 8.17
Weighted Average Exercise Price, Exercisable (in dollars per share) | 9.47 |
Weighted Average Exercise Price, Unvested (in dollars per share) | 5.34 |
Weighted Average Grant Date Fair Value Per Share |  |
Outstanding, Weighted average grant date fair value at beginning of period (in dollars per share) | 7.60 |
Weighted average estimated fair value of the stock options granted (in dollars per share) | 3.92 |
Expired, Weighted average grant date fair value (in dollars per share) | 6.91 |
Expired, Weighted average grant date fair value (in dollars per share) | 5.75 |
Ending, Weighted average grant date fair value at beginning of period (in dollars per share) | 6.42 | $ 7.60
Exercisable, Weighted average grant date fair value (in dollars per share) | 8.73 |
Unvested Weighted average grant date fair value (in dollars per share) | $ 4.70 |
Weighted Average Remaining Contractual Term (in years) and Aggregate Intrinsic Value |  |
Weighted Average Remaining Contractual Term (in years), Outstanding | 8 years 7 months 6 days | 8 years 3 months 18 days
Weighted Average Remaining Contractual Term (in years), Granted | 9 years 8 months 12 days |
Weighted Average Remaining Contractual Term (in years), Exercisable | 7 years 4 months 24 days |
Weighted Average Remaining Contractual Term (in years), Unvested | 9 years 4 months 24 days |
Aggregate Intrinsic Value, Outstanding | $ 433 | $ 147
Aggregate Intrinsic Value, Exercisable | 74 |
Aggregate Intrinsic Value, Unvested | $ 358 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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