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Stock-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Shares, Granted 8,187,750  
Weighted Average Remaining Contractual Life (in Years), outstanding at Beginning balance 1 year 4 months 2 days 2 years 2 months 8 days
2016 Stock Incentive Plan [Member]    
Number of Shares Common stock options, outstanding at Beginning balance 9,405,541 2,176,637
Number of Shares, Granted   8,187,750
Number of Shares, Exercised (25,000) (125,000)
Number of Shares, Forfeited (1,197,776) (732,353)
Number of Shares, Expired (118,204) (101,493)
Number of Shares Common stock options, outstanding at Ending balance 8,064,561 9,405,541
Number of Shares Common stock options, exercisable at Ending balance 4,970,584  
Number of Shares Common stock options, not vested at Ending balance 3,093,977  
Number of Shares Common stock options, available for future grants at Ending balance 1,935,439  
Weighted Average Exercise Price, outstanding at Beginning balance $ 0.61 $ 1.25
Weighted Average Exercise Price, Granted   0.84
Weighted Average Exercise Price, Exercised 0.17 0.17
Weighted Average Exercise Price, Forfeited 0.73 1.41
Weighted Average Exercise Price, Expired 1.09 1.49
Weighted Average Exercise Price, outstanding at Ending balance 0.62 $ 0.61
Weighted Average Exercise Price, exercisable at Ending balance $ 1.02  
Weighted Average Remaining Contractual Life (in Years), outstanding at Beginning balance 9 years 3 months 19 days 9 years 2 months 30 days
Weighted Average Remaining Contractual Life (in Years), outstanding at Ending balance 8 years 4 months 2 days 9 years 3 months 19 days
Weighted Average Remaining Contractual Life (in Years), exercisable at Ending balance 8 years 2 months 30 days  
2019 Equity Incentive Plan [Member]    
Number of Shares Common stock options, outstanding at Beginning balance  
Number of Shares, Granted 68,180,863  
Number of Shares, Forfeited (3,167,218)  
Number of Shares Common stock options, outstanding at Ending balance 65,013,645
Number of Shares Common stock options, exercisable at Ending balance  
Number of Shares Common stock options, not vested at Ending balance 64,958,089  
Number of Shares Common stock options, available for future grants at Ending balance 19,986,355  
Number of Shares Common stock options, vested at Ending balance 55,556  
Weighted Average Exercise Price, outstanding at Beginning balance  
Weighted Average Exercise Price, Granted 0.53  
Weighted Average Exercise Price, Forfeited 0.53  
Weighted Average Exercise Price, outstanding at Ending balance $ 0.53
Weighted Average Remaining Contractual Life (in Years), outstanding at Beginning balance 0 years  
Weighted Average Remaining Contractual Life (in Years), outstanding at Ending balance 9 years 5 months 5 days  
Stock Outside Option 2016 Plan and 2019 Plan [Member]    
Number of Shares Common stock options, outstanding at Beginning balance 2,414,000
Number of Shares, Granted 1,500,000 2,414,000
Number of Shares, Exercised (2,000)  
Number of Shares, Forfeited (180,000)  
Number of Shares, Expired (7,333)  
Number of Shares Common stock options, outstanding at Ending balance 3,724,667 2,414,000
Number of Shares Common stock options, exercisable at Ending balance  
Number of Shares Common stock options, not vested at Ending balance 2,521,000  
Number of Shares Common stock options, vested at Ending balance 1,203,667  
Weighted Average Exercise Price, outstanding at Beginning balance $ 0.36
Weighted Average Exercise Price, Granted 0.57 0.36
Weighted Average Exercise Price, Exercised 0.35  
Weighted Average Exercise Price, Forfeited 0.35  
Weighted Average Exercise Price, Expired 0.35  
Weighted Average Exercise Price, outstanding at Ending balance 0.21 $ 0.36
Weighted Average Exercise Price, exercisable at Ending balance $ 0.89  
Weighted Average Remaining Contractual Life (in Years), outstanding at Beginning balance 9 years 11 months 8 days  
Weighted Average Remaining Contractual Life (in Years), Granted 9 years 11 months 8 days  
Weighted Average Remaining Contractual Life (in Years), outstanding at Ending balance 9 years 15 days 9 years 11 months 8 days
Weighted Average Remaining Contractual Life (in Years), exercisable at Ending balance 9 years 7 days