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Stockholders' Equity - Schedule of Stock Option Assumptions (Details) - Equity Incentive 2011 Plan [Member] - $ / shares
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock options granted     266,594 410,215 411,350
Weighted average exercise price, granted     $ 2.64 $ 0.69 $ 0.69
Expected term (in years) 6 years 6 years 6 years 6 years  
Weighted average volatility (percentage) 120.67% 116.64% 120.14% 108.56%  
Weighted average risk free interest rate (percentage) 0.93% 0.42% 0.94% 0.46%  
Expected dividends 0.00% 0.00% 0.00% 0.00%  
Weighted average grant date fair value, granted     $ 2.81 $ 0.56 $ 0.56