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Stock-Based Compensation - Non-options (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Weighted average price |  |  |  |  |  |  |
Share-based compensation costs recognized |  | $ 1,057 | $ 6,124 | $ 4,490 | $ 11,001 |  |
BTI RSU |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  | 185,000 |  |  |
Granted (in shares) |  |  |  | 5,000 |  |  |
Vested (in shares) |  |  |  | (55,000) |  |  |
Cancelled (in shares) |  |  |  | (6,000) |  |  |
Outstanding, ending balance (in shares) |  | 129,000 |  | 129,000 |  | 185,000 |
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  |  |  |  | $ 19.62 |
Unrecognized stock-based compensation expense |  | $ 1,040 | 3,358 | $ 1,040 | 3,358 |  |
BTI RSU | RSU vesting 100% at one year anniversary |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 5,000 |  |  |
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  |  | $ 2.52 |  |  |
Vesting period |  |  |  | 1 year |  |  |
BTI RSU | RSU vesting 25% at one year and remaining in 12 quarters |  |  |  |  |  |  |
Weighted average price |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |
Vesting (as a percent) |  |  |  | 25.00% |  |  |
BTI PSU |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  | 527,000 |  |  |
Granted (in shares) | 543,000 |  |  |  |  |  |
Vested (in shares) |  |  |  | 0 |  |  |
Cancelled (in shares) |  |  |  | (98,000) |  |  |
Outstanding, ending balance (in shares) |  | 429,000 |  | 429,000 |  | 527,000 |
Weighted average price |  |  |  |  |  |  |
Cancelled, Weighted average price (in dollars per share) |  |  |  | $ 2.43 |  |  |
Unrecognized stock-based compensation expense |  | $ 123 |  | $ 123 |  |  |
BTI PSU | Tranche One |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) | 209,000 |  |  |  |  |  |
BTI PSU | Tranche Two |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) | 334,000 |  |  |  |  |  |
OnkosXcel PSU |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  | 1,240 |  |  |
Granted (in shares) |  |  |  |  |  | 30 | 1,310
Cancelled (in shares) |  |  |  | (79) |  |  |
Outstanding, ending balance (in shares) |  | 1,161 |  | 1,161 |  | 1,240 |
Vested aggregate (in shares) |  | 847 |  | 847 |  |  |
Weighted average price |  |  |  |  |  |  |
Outstanding, Weighted average price beginning balance (in dollars per share) |  |  |  | $ 5,626 |  |  |
Cancelled, Weighted average price (in dollars per share) |  |  |  | 5,506 |  |  |
Vested, Weighted average price (in dollars per share) |  | $ 5,550 |  | $ 5,550 |  |  |
Outstanding, Weighted average price ending balance (in dollars per share) |  |  |  |  |  | $ 5,626 |
Unrecognized stock-based compensation expense |  | $ 372 | 3,833 | $ 372 | 3,833 |  |
OnkosXcel PSU | Employee |  |  |  |  |  |  |
Weighted average price |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 48 months |
OnkosXcel PSU | Executive officers |  |  |  |  |  |  |
Weighted average price |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 24 months |
OnkosXcel RSUs |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  | 225 |  |  |
Granted (in shares) |  |  |  |  |  | 225 |
Cancelled (in shares) |  |  |  | (8) |  |  |
Outstanding, ending balance (in shares) |  | 217 |  | 217 |  | 225 |
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  |  |  |  | $ 10 |
Unrecognized stock-based compensation expense |  | $ 312 | $ 1,648 | $ 312 | $ 1,648 |  |
OnkosXcel RSUs | Tranche One |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 125,000 |
Weighted average price |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 180 days |
OnkosXcel RSUs | Tranche Two |  |  |  |  |  |  |
Weighted average price |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years |
Vesting (as a percent) |  |  |  |  |  | 25.00% |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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