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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Royalties $ 83 $ 74
Costs and expenses:    
Research and development 9,052 7,208
Selling, general and administrative 3,083 3,940
Total operating expenses 12,135 11,148
Loss from operations (12,052) (11,074)
Interest income, net 940 130
Other income (expense), net (111) (49)
Total other income (expense), net 829 81
Net loss (11,223) (10,993)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6)
Net loss attributable to common stockholders $ (11,229) $ (10,999)
Net loss per common share - basic (in dollars per share) $ (0.25) $ (0.25)
Net loss per common share - diluted (in dollars per share) $ (0.25) $ (0.25)
Weighted-average shares outstanding - basic (in shares) 44,677 43,231
Weighted-average shares outstanding - diluted (in shares) 44,677 43,231