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Stock-based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Jan. 31, 2019
Stock-based Compensation          
Shares authorized (in shares)         2,000,000
Shares reserved for issuance (in shares)         2,000,000
Remaining stock-based compensation expense for unvested stock options $ 12,752   $ 12,752    
Accelerated award vesting period     6 months    
Stock-based compensation expense 800,000 $ 0 $ 1,100,000 $ 0  
Remaining stock-based compensation expense for unvested restricted stock units 1,700,000   1,700,000    
Share-based Payment Arrangement, Option          
Stock-based Compensation          
Stock-based compensation expense, increase 5,000   $ 5,000    
Vesting period     1 year    
Restricted Stock Units (RSUs)          
Stock-based Compensation          
Stock-based compensation expense, increase $ 411,000   $ 411,000    
Vesting period     3 years    
Maximum          
Stock-based Compensation          
Award term     10 years    
Incentive Stock Optionee, Stock Ownership Greater than Ten Percent of Voting Power          
Stock-based Compensation          
Minimum exercise price to fair market value of common stock at the date of grant 110.00%   110.00%    
Incentive Stock Optionee, Stock Ownership Greater than Ten Percent of Voting Power | Maximum          
Stock-based Compensation          
Award term     5 years