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Stock-Based Compensation Plan - Narrative (Details) - USD ($)
3 Months Ended
Dec. 19, 2019
Mar. 31, 2022
Mar. 31, 2021
Stock Based Compensation Plans [Line Items]      
Stock-based compensation expense   $ 200,000 $ 100,000
Aggregate intrinsic value of outstanding stock options   34,000  
Unamortized stock-based compensation expense for outstanding options   $ 1,800,000  
Weighted average vesting period   2 years 9 months 18 days  
Stock Incentive Plan 2017 [Member]      
Stock Based Compensation Plans [Line Items]      
Increase in number of shares reserved for grant 600,000    
Number of shares reserved for grant and issuance 660,000    
Expiration period (in years)   10 years  
Research and Development Expense [Member]      
Stock Based Compensation Plans [Line Items]      
Stock-based compensation expense   $ 47,000 29,000
General and Administrative Expense [Member]      
Stock Based Compensation Plans [Line Items]      
Stock-based compensation expense   $ 200,000 $ 100,000