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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%