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Stock-Based Compensation - Non-options (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2024 | Oct. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Weighted average price |  |  |  |  |  |  |
Share-based compensation costs recognized |  |  | $ 1,865 | $ 4,014 | $ 6,355 | $ 15,015 |
BTI RSU |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  |  | 185,000 |  |
Granted (in shares) |  |  |  |  | 25,000 |  |
Vested (in shares) |  |  |  |  | (69,000) |  |
Cancelled (in shares) |  |  |  |  | (6,000) |  |
Forfeited (in shares) |  |  |  |  | (6,000) |  |
Outstanding, ending balance (in shares) |  |  | 135,000 |  | 135,000 |  | 185,000
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  |  |  |  |  | $ 19.62
Unrecognized stock-based compensation expense |  |  | $ 854 | 3,096 | $ 854 | 3,096 |
BTI RSU | RSU vesting 100% at one year anniversary |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Granted (in shares) |  |  | 20,000 |  | 25,000 |  |
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  | $ 1.20 |  | $ 1.46 |  |
Vesting period |  |  | 1 year |  | 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) | 1,388,000 | 543,000 |  |  | 1,388,000 |  |
Vested (in shares) |  |  |  |  | 0 |  |
Cancelled (in shares) |  |  |  |  | (125,000) |  |
Outstanding, ending balance (in shares) |  |  | 1,790,000 |  | 1,790,000 |  | 527,000
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) | $ 1.20 |  |  |  |  |  | $ 2.43
Vesting period | 1 year | 1 year |  |  |  |  |
Unrecognized stock-based compensation expense |  |  | $ 0 |  | $ 0 |  |
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) |  |  |  |  | 15 |  | 30
Cancelled (in shares) |  |  |  |  | (79) |  |
Outstanding, ending balance (in shares) |  |  | 1,176 |  | 1,176 |  | 1,240
Vested aggregate (in shares) |  |  | 906 |  | 906 |  |
Weighted average price |  |  |  |  |  |  |
Outstanding, Weighted average price beginning balance (in dollars per share) |  |  |  |  | $ 5,626 |  |
Granted, Weighted average price (in dollars per share) |  |  |  |  | 10,176 |  |
Cancelled, Weighted average price (in dollars per share) |  |  |  |  | 5,506 |  |
Vested, Weighted average price (in dollars per share) |  |  | $ 5,557 |  | $ 5,557 |  |
Outstanding, Weighted average price ending balance (in dollars per share) |  |  |  |  |  |  | $ 5,626
Vesting period |  |  |  |  | 48 months |  |
Unrecognized stock-based compensation expense |  |  | $ 496 | 3,203 | $ 496 | 3,203 |
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
Vested (in shares) |  |  |  |  | (35) |  |
Cancelled (in shares) |  |  |  |  | (8) |  |
Outstanding, ending balance (in shares) |  |  | 182 |  | 182 |  | 225
Weighted average price |  |  |  |  |  |  |
Granted, Weighted average price (in dollars per share) |  |  |  |  |  |  | $ 10
Unrecognized stock-based compensation expense |  |  | $ 261 | $ 2,151 | $ 261 | $ 2,151 |
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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