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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Royalties $ 74 $ 72
Costs and expenses:    
Research and development 7,208 3,279
Selling, general and administrative 3,940 2,235
Total operating expenses 11,148 5,514
Loss from operations (11,074) (5,442)
Interest income, net 130 57
Gain (loss) from change in fair value of derivative financial instruments—warrants 0 207
Other income (expense), net (49) (1)
Total other income (expense), net 81 263
Net loss (10,993) (5,179)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6)
Net loss attributable to common stockholders $ (10,999) $ (5,185)
Net loss per common share - basic (in dollars per share) $ (0.25) $ (0.14)
Net loss per common share - diluted (in dollars per share) $ (0.25) $ (0.14)
Weighted-average shares outstanding - basic (in shares) 43,231 37,164
Weighted-average shares outstanding - diluted (in shares) 43,231 37,164