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1. Summary of Significant Accounting Policies (Details - Options outstanding) - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Number of Shares    
Outstanding options, beginning balance 14,421  
Granted 1,490  
Exercised (483) (315)
Forfeited (75)  
Outstanding options, ending balance 15,353  
Options exercisable at the end of period 11,722  
Weighted Average Exercise Price    
Outstanding options, beginning balance $ 4.57  
Granted 3.53  
Exercised 0.86  
Forfeited 4.00  
Outstanding options, ending balance 4.58  
Options exercisable at the end of period $ 4.87  
Weighted Average Remaining Contractual Term    
Weighted average remaining contractual term options outstanding 3 years 7 months 2 days  
Weighted average remaining contractual term options exercisable 2 years 11 months 8 days