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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%