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Share-Based Compensation - 10Q - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual rate at which authorized shares of common stock increase 4.00%            
Share-based award contractual life 10 years         10 years  
Weighted average fair value of grants during period (in dollars per share)       $ 3.76 $ 9.34 $ 9.34  
Unrecognized compensation expense   $ 1,400,000   $ 1,400,000   $ 100,000  
Research and Development Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense         $ 100,000 $ 100,000 $ 100,000
General and Administrative Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense             300,000
Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based awards vesting period 1 year         1 year  
Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based awards vesting period 3 years         3 years  
Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total shares of common stock authorized for issuance (in shares) 1,266,092            
Shares of common stock available for grant (in shares)   783,733   783,733      
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected period for recognition       1 year 3 months 14 days   3 months  
Unrecognized expense related to RSUs   $ 100,000   $ 100,000   $ 400  
Restricted Stock Units (RSUs) [Member] | Research and Development Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense   10,000   $ 25,000   $ 1,800 300,000
Restricted Stock Units (RSUs) [Member] | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based awards vesting period 1 year         1 year  
Restricted Stock Units (RSUs) [Member] | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based awards vesting period 3 years         3 years  
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected period for recognition       1 year 9 months 10 days   1 year 2 months 1 day  
Stock Options | Research and Development Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense   18,000 $ 26,000 $ 100,000 100,000 $ 75,000 29,000
Stock Options | General and Administrative Expense              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense   $ 100,000 $ 4,000 $ 200,000 $ 12,000 $ 29,000 $ 16,000