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Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Royalty revenues $ 359 $ 366
Costs and expenses:    
Research and development 17,376 11,235
Selling, general and administrative 11,838 8,217
Total operating expenses 29,214 19,452
Loss from operations (28,855) (19,086)
Other income (expense), net:    
Interest income 264 90
Interest expense 0 (2)
Other gain (loss), net 15 (28)
Gain (loss) from changes in fair value of derivative financial instruments—warrants 285 (281)
Total other income (expense), net 564 (221)
Net loss (28,291) (19,307)
Preferred stock dividend payable on Series A Convertible Preferred Stock (24) (24)
Net loss attributable to common stockholders $ (28,315) $ (22,598)
Net loss per common share - basic (in dollars per share) $ (0.73) $ (1.08)
Net loss per common share - diluted (in dollars per share) $ (0.73) $ (1.08)
Weighted-average shares outstanding - basic (in shares) 39,030 20,875
Weighted-average shares outstanding - diluted (in shares) 39,030 20,875
Series D Convertible Preferred Stock    
Other income (expense), net:    
Deemed dividend recognized on beneficial conversion features of Convertible Preferred Stock issuance $ 0 $ (602)
Series E Convertible Preferred Stock    
Other income (expense), net:    
Deemed dividend recognized on beneficial conversion features of Convertible Preferred Stock issuance $ 0 $ (2,665)