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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Licensing revenue $ 1,900,000 $ 0 $ 7,600,000 $ 0
Operating expenses:        
Cost of licensing revenue 100,000 0 200,000 0
Research and development 3,456,000 2,280,000 7,740,000 4,144,000
General and administrative 2,797,000 1,987,000 6,358,000 4,187,000
Total operating expenses 6,353,000 4,267,000 14,298,000 8,331,000
Operating loss (4,453,000) (4,267,000) (6,698,000) (8,331,000)
Non-operating income (expense), net:        
Change in fair value of warrant liability (28,000) (16,000) (59,000) 19,000
Change in fair value of contingent consideration (134,000) (143,000) (263,000) (281,000)
Interest income 2,000 1,000 4,000 25,000
Total non-operating expense, net (160,000) (158,000) (318,000) (237,000)
Net loss (4,613,000) (4,425,000) (7,016,000) (8,568,000)
Deemed dividend arising from warrant modifications 0 0 0 (78,000)
Net loss attributable to common stockholders, basic (4,613,000) (4,425,000) (7,016,000) (8,646,000)
Net loss attributable to common stockholders, diluted $ (4,613,000) $ (4,425,000) $ (7,016,000) $ (8,646,000)
Per share information:        
Net loss per common share attributable to common stockholders, basic (in dollars per share) $ (0.30) $ (0.66) $ (0.47) $ (1.32)
Net loss per common share attributable to common stockholders, diluted (in dollars per share) $ (0.30) $ (0.66) $ (0.47) $ (1.32)
Weighted-average common shares outstanding, basic (in shares) 15,270,288 6,717,900 15,074,887 6,546,440
Weighted-average common shares outstanding, diluted (in shares) 15,270,288 6,717,900 15,074,887 6,546,440