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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Royalties $ 91 $ 68 $ 165 $ 140
Costs and expenses:        
Research and development 7,448 4,119 14,656 7,398
Selling, general and administrative 3,086 2,838 7,026 5,073
Total operating expenses 10,534 6,957 21,682 12,471
Loss from operations (10,443) (6,889) (21,517) (12,331)
Interest income, net 253 71 383 115
Gain (loss) from change in fair value of derivative financial instruments—warrants 0 61 0 268
Other income (expense), net (253) 0 (302) 12
Total other income (expense), net 0 132 81 395
Net loss (10,443) (6,757) (21,436) (11,936)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (12) (12)
Net loss attributable to common stockholders $ (10,449) $ (6,763) $ (21,448) $ (11,948)
Net loss per common share - basic (in dollars per share) $ (0.24) $ (0.17) $ (0.50) $ (0.31)
Net loss per common share - diluted (in dollars per share) $ (0.24) $ (0.17) $ (0.50) $ (0.31)
Weighted-average shares outstanding - basic (in shares) 43,306 38,761 43,269 37,967
Weighted-average shares outstanding - diluted (in shares) 43,306 38,761 43,269 37,967