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Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]    
Number of stock options, Beginning Balance 109,281,000 108,613,000
Number of stock options, Granted 7,000,000 2,500,000
Number of stock options, Exercised (5,000,000)
Number of stock options, Expired/Forfeited (6,195,000) (1,832,000)
Number of stock options, Ending Balance 105,086,000 109,281,000
Weighted avg exercise price per share, Beginning Balance $ 5.84 $ 5.96
Weighted avg exercise price per share, Granted 7.91 6.84
Weighted avg exercise price per share, Exercised 0.96
Weighted avg exercise price per share, Expired/Forfeited 7.36 7.44
Weighted avg exercise price per share, Ending Balance 6.25 5.84
Weighted avg grant date fair value per share, Beginning Balance 6.12 5.88
Weighted avg grant date fair value per share, Granted 6.89 6.12
Weighted avg grant date fair value per share, Exercised 0.96
Weighted avg grant date fair value per share, Expired/Forfeited 7.26 7.32
Weighted avg grant date fair value per share, Ending Balance $ 6.06 $ 6.12
Weighted avg remaining contractual life (in years), Beginning Balance 5 years 11 months 19 days 6 years 10 months 28 days
Weighted avg remaining contractual life (in years), Granted 9 years 3 months 26 days 9 years 9 months 18 days
Weighted avg remaining contractual life (in years), Exercised 6 months 0 years
Weighted avg remaining contractual life (in years), Expired/Forfeited 6 years 11 months 23 days 7 years 6 months 18 days
Weighted avg remaining contractual life (in years), Ending Balance 5 years 4 months 17 days 5 years 11 months 19 days
Aggregate intrinsic value, Beginning Balance $ 601,668 $ 920,156
Aggregate intrinsic value, Ending Balance 814,090 $ 601,668
Aggregate intrinsic value, Exercisable Ending 82,972  
Aggregate intrinsic value, Unvested Ending $ 22,114