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Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]    
Number of stock options, Beginning Balance 437,126,000  
Number of stock options, Granted 20,000,000
Number of stock options, Exercised (10,000,000)  
Number of stock options, Expired/Forfeited (25,325,000)  
Number of stock options, Ending Balance 421,801,000  
Number of stock options, Exercisable Ending 292,738,000  
Number of stock options, Unvested Ending 129,063,000  
Weighted avg exercise price per share, Beginning Balance $ 1.46  
Weighted avg exercise price per share, Granted 1.81  
Weighted avg exercise price per share, Exercised 1.60  
Weighted avg exercise price per share, Expired/Forfeited  
Weighted avg exercise price per share, Ending Balance 1.49  
Weighted avg exercise price per share, Exercisable Ending 1.35  
Weighted avg exercise price per share, Unvested Ending 1.78  
Weighted avg grant date fair value per share, Beginning Balance 1.49  
Weighted avg grant date fair value per share, Granted 2.05  
Weighted avg grant date fair value per share, Exercised 0.24  
Weighted avg grant date fair value per share, Expired/Forfeited 1.84  
Weighted avg grant date fair value per share, Ending Balance 1.53  
Weighted avg grant date fair value per share, Exercisable Ending 1.37  
Weighted avg grant date fair value per share, Unvested Ending $ 1.89  
Weighted avg remaining contractual life (in years), Beginning Balance 5 years 11 months 19 days  
Weighted avg remaining contractual life (in years), Granted 9 years 7 months 24 days  
Weighted avg remaining contractual life (in years), Exercised 9 months  
Weighted avg remaining contractual life (in years), Expired/Forfeited 7 years 2 months 23 days  
Weighted avg remaining contractual life (in years), Ending Balance 5 years 8 months 5 days  
Weighted avg remaining contractual life (in years), Exercisable Ending 4 years 4 months 28 days  
Weighted avg remaining contractual life (in years), Unvested Ending 8 years 6 months 14 days  
Aggregate intrinsic value, Beginning Balance $ 150,417  
Aggregate intrinsic value, Ending Balance 131,913  
Aggregate intrinsic value, Exercisable Ending 131,913  
Aggregate intrinsic value, Unvested Ending