XML 36 R27.htm IDEA: XBRL DOCUMENT v3.20.2
Stock-Based Compensation Plan - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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 $ 27,000   $ 27,000    
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 1,100,000   1,100,000    
Stock-based compensation expense 100,000 $ 200,000 $ 300,000 $ 300,000  
Share-based Compensation Arrangement By Share-based Payment Award, Options Outstanding And Unvested, Weighted Average Remaining Contractual Term     2 years 9 months 18 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 24,000 26,000 $ 45,000 100,000  
General and Administrative Expense [Member]          
Stock Based Compensation Plans [Line Items]          
Stock-based compensation expense $ 100,000 $ 200,000 $ 200,000 $ 300,000