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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenues, net $ 3,176 $ 2,931 $ 8,305 $ 7,563
Operating expenses:        
Cost of royalties 15 22 45 81
Research and development 6,432 9,723 22,429 29,594
General and administrative 3,653 3,753 11,163 13,436
Total operating expenses 10,100 13,498 33,637 43,111
Loss from operations (6,924) (10,567) (25,332) (35,548)
Other income (expense):        
Interest income 80 325 265 1,541
Income (expense) related to the sale of future royalties (885) 150 (1,871) 236
Total other income (expense) (805) 475 (1,606) 1,777
Net loss $ (7,729) $ (10,092) $ (26,938) $ (33,771)
Net loss per common share, basic (in dollars per share) $ (0.49) $ (1.70) $ (2.19) $ (5.77)
Net loss per common share, diluted (in dollars per share) $ (0.49) $ (1.70) $ (2.19) $ (5.77)
Weighted average common shares, basic (in shares) 15,680,178 5,940,924 12,293,558 5,847,982
Weighted average common shares, diluted (in shares) 15,680,178 5,940,924 12,293,558 5,847,982
Net loss $ (7,729) $ (10,092) $ (26,938) $ (33,771)
Other comprehensive income:        
Unrealized loss on marketable securities 0 (42) 0 (229)
Comprehensive loss $ (7,729) $ (10,134) $ (26,938) $ (34,000)