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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Royalties $ 108 $ 91 $ 191 $ 165
Costs and expenses:        
Research and development 8,020 7,448 17,072 14,656
Selling, general and administrative 4,296 3,086 7,379 7,026
Total operating expenses 12,316 10,534 24,451 21,682
Loss from operations (12,208) (10,443) (24,260) (21,517)
Interest income, net 1,053 253 1,993 383
Other income (expense), net 5 (253) (106) (302)
Total other income (expense), net 1,058 0 1,887 81
Net loss (11,150) (10,443) (22,373) (21,436)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (12) (12)
Net loss attributable to common stockholders $ (11,156) $ (10,449) $ (22,385) $ (21,448)
Net loss per common share - basic (in dollars per share) $ (0.25) $ (0.24) $ (0.50) $ (0.50)
Net loss per common share - diluted (in dollars per share) $ (0.25) $ (0.24) $ (0.50) $ (0.50)
Weighted-average shares outstanding - basic (in shares) 44,677 43,306 44,677 43,269
Weighted-average shares outstanding - diluted (in shares) 44,677 43,306 44,677 43,269