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Equity Incentive Plan- option activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, Options Outstanding at end of the period 513,673,885      
Number of shares, Exercisable options at end of the period 128,451,772      
2014 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, Options Outstanding at beginning of the period 142,949,035 112,649,035 94,349,035  
Number of shares, Granted 409,396,700 30,300,000 208,000,000  
Number of shares, Forfeited (38,671,850)   (2,500,000)  
Number of shares, Options Outstanding at end of the period 513,673,885 142,949,035 112,649,035 94,349,035
Number of shares, Exercisable options at end of the period 128,451,772      
Weighted average exercise price, Outstanding at beginning of the period $ 0.07 $ 0.09 $ 0.10  
Weighted average exercise price, Granted 0.01 0.02 0.02  
Weighted average exercise price, Forfeited 0.15   0.02  
Weighted average exercise price, Outstanding at end of the period 0.02 0.07 0.09 $ 0.10
Options exercisable at end of the period, Weighted average exercise price 0.04      
Weighted average grant date fair value, Granted 0.01 $ 0.01 0.01  
Weighted average grant date fair value, Forfeited $ 0.10   $ 0.02  
Weighted average remaining contractual term, Options outstanding during the period (in years) 8 years 8 months 12 days 6 years 9 months 18 days 7 years 1 month 6 days 7 years 7 months 6 days
Weighted average remaining contractual term, Options exercisable at end of the period (in years) 6 years 7 months 6 days      
Aggregate intrinsic value, Options outstanding at beginning of the period   $ 0 $ 0  
Aggregate intrinsic value, Options outstanding at end of the period $ 0   $ 0 $ 0
Aggregate intrinsic value, Options exercisable at end of the period $ 0      
Exercise of warrants (in shares) 890,000,000      
Share options | 2014 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise of warrants (in shares) 0 0 0