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Stock-Based Compensation Plan - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 19, 2019
Stock Based Compensation Plans [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 15,000   $ 15,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 1,000,000   1,000,000    
Stock-based compensation expense 100,000 $ 200,000 $ 400,000 $ 500,000  
Share-based Compensation Arrangement By Share-based Payment Award, Options Outstanding And Unvested, Weighted Average Remaining Contractual Term     2 years 8 months 12 days    
Maximum [Member]          
Stock Based Compensation Plans [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         660,000
Research and Development Expense [Member]          
Stock Based Compensation Plans [Line Items]          
Stock-based compensation expense 27,000 24,000 $ 100,000 100,000  
General and Administrative Expense [Member]          
Stock Based Compensation Plans [Line Items]          
Stock-based compensation expense $ 100,000 $ 200,000 $ 400,000 $ 400,000