v3.26.1
Stock-Based Compensation - Non-options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 04, 2025
Apr. 08, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Weighted average price              
Share-based compensation costs     $ 358 $ 1,556 $ 793 $ 1,736  
BTI RSU              
Number of shares              
Outstanding, beginning balance (in shares)         107,000    
Granted (in shares)   66,000     409,000    
Vested (in shares)         (205,000)    
Cancelled (in shares)         (3,000)    
Outstanding, ending balance (in shares)     308,000   308,000   107,000
Weighted average price              
Vesting period   1 year          
Unrecognized stock-based compensation expense     $ 380 445 $ 380 445  
Fair value, non-option         $ 254    
BTI RSU | RSU vesting 100% at one year anniversary              
Number of shares              
Granted (in shares)         409,000    
Weighted average price              
Granted, Weighted average price (in dollars per share)         $ 1.86    
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 RSU | Nonemployee consultant              
Weighted average price              
Vesting period 2 years            
OnkosXcel PSU              
Number of shares              
Outstanding, beginning balance (in shares)         1,072    
Granted (in shares)         0   15
Cancelled (in shares)         0    
Forfeited (in shares)         0    
Outstanding, ending balance (in shares)     1,072   1,072   1,072
Vested aggregate (in shares)     1,061   1,061    
Weighted average price              
Outstanding, Weighted average price beginning balance (in dollars per share)         $ 5,663    
Granted, Weighted average price (in dollars per share)         0    
Cancelled, Weighted average price (in dollars per share)         0    
Forfeited, Weighted average price (in dollars per share)         0    
Vested, Weighted average price (in dollars per share)     $ 5,611   $ 5,611    
Outstanding, Weighted average price ending balance (in dollars per share)             $ 5,663
Vesting period         48 months    
Unrecognized stock-based compensation expense     $ 44 40 $ 44 40  
OnkosXcel RSUs              
Number of shares              
Outstanding, beginning balance (in shares)         135    
Granted (in shares)         0    
Vested (in shares)         (4)    
Cancelled (in shares)         0    
Outstanding, ending balance (in shares)     131   131   135
Weighted average price              
Unrecognized stock-based compensation expense     $ 9 $ 40 $ 9 $ 40