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Stockholders' Equity - Schedule of Stock Option Assumptions (Details) - Equity Incentive 2011 Plan [Member] - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock options granted     113,689 217,580 411,350
Weighted average exercise price, granted     $ 3.26 $ 0.18 $ 0.69
Expected term (in years) 6 years 6 years 6 years 6 years  
Weighted average volatility (percentage) 120.35% 101.38% 119.43% 101.40%  
Weighted average risk free interest rate (percentage) 1.12% 0.44% 0.95% 0.49%  
Expected dividends 0.00% 0.00% 0.00% 0.00%  
Weighted average grant date fair value, granted     $ 2.81 $ 0.16 $ 0.56