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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating expenses    
Research and development $ 6,131,000 $ 8,128,000
General and administrative 10,052,000 6,056,000
Restructuring expense 2,282,000  
Goodwill impairment 0 1,867,000
Total operating expenses 18,465,000 16,051,000
Loss from operations (18,465,000) (16,051,000)
Other income, net 79,000 40,000
Warrant inducement expense (4,829,000)  
Loss before income tax benefit (23,215,000) (16,011,000)
Income tax benefit 404,000  
Net loss and other comprehensive loss $ (22,811,000) $ (16,011,000)
Net loss per share, basic and diluted $ (15.72) $ (24.42)
Weighted-average common shares outstanding, basic and diluted 1,451,432 655,526