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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues:        
Royalties $ 86 $ 136 $ 226 $ 247
Total revenues 86 136 226 247
Costs and expenses:        
Research and development 4,154 2,855 11,552 8,036
Selling, general and administrative 2,930 1,644 8,003 4,800
Total operating expenses 7,084 4,499 19,555 12,836
Loss from operations (6,998) (4,363) (19,329) (12,589)
Interest income, net 70 16 185 67
Gain (loss) from change in fair value of derivative financial instruments—warrants 12 (144) 280 (186)
Other income (expense), net 3 (6) 15 (2)
Net loss (6,913) (4,497) (18,849) (12,710)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (18) (18)
Net loss attributable to common stockholders $ (6,919) $ (4,503) $ (18,867) $ (15,995)
Net loss per common share - basic (in dollars per share) $ (0.17) $ (0.19) $ (0.49) $ (1.00)
Net loss per common share - diluted (in dollars per share) $ (0.17) $ (0.19) $ (0.49) $ (1.00)
Weighted-average shares outstanding - basic (in shares) 39,552 23,341 38,501 15,942
Weighted-average shares outstanding - diluted (in shares) 39,552 23,341 38,501 15,942
Series D Convertible Preferred Stock        
Costs and expenses:        
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance $ 0 $ 0 $ 0 $ (602)
Series E Convertible Preferred Stock        
Costs and expenses:        
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance $ 0 $ 0 $ 0 $ (2,665)