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1. Nature of Activities and Summary of Significant Accounting Policies (Details 1) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total number of potentially dilutive shares excluded from the basic and diluted net loss per share calculation (in thousands) 6,498 7,089
Series B preferred (post split basis)    
Total number of potentially dilutive shares excluded from the basic and diluted net loss per share calculation (in thousands) 132 132
Common stock options and warrants    
Total number of potentially dilutive shares excluded from the basic and diluted net loss per share calculation (in thousands) 5,080 5,688
Debt with conversion feature at $30 per share of common stock    
Total number of potentially dilutive shares excluded from the basic and diluted net loss per share calculation (in thousands) 1,286 1,269