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REVENUE AND SEGMENT INFORMATION - Significant expense categories (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
SEGMENT INFORMATION        
Total research and development $ 1,262 $ 1,519 $ 2,924 $ 3,766
Selling, general and administrative        
Total selling, general and administrative 9,167 8,554 17,599 17,837
Capital expenditures of the segment     100 100
Single reportable segment        
SEGMENT INFORMATION        
Clinical expenses 812 936 1,791 2,563
Other research and development expenses 450 583 1,133 1,203
Total research and development 1,262 1,519 2,924 3,766
Selling, general and administrative        
Royalty expense 286 528 544 1,240
Stock-based compensation 429 989 1,056 1,949
Legal, financial and other consulting 1,364 820 2,002 1,501
Other general and administrative 7,088 6,217 13,997 13,147
Total selling, general and administrative $ 9,167 $ 8,554 $ 17,599 $ 17,837