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7. Shareholders' Equity (Details - Option activity)
shares in Thousands
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Shares  
Options outstanding at the beginning of period | shares 14,421
Granted | shares 1,490
Exercised | shares (488)
Forfeited/Expired | shares (75)
Options outstanding at the end of period | shares 15,348
Options exercisable at the end of period | shares 11,717
Weighted Average Exercise Price  
Options outstanding at the beginning of period | $ / shares $ 4.57
Granted | $ / shares 3.53
Exercised | $ / shares 0.86
Forfeited/Expired | $ / shares 4.00
Options outstanding at the end of period | $ / shares 4.59
Options exercisable at the end of period | $ / shares $ 4.87
Weighted Average Remaining Contractual Term  
Weighted average remaining contractual term, end of period 3 years 4 months 2 days
Weighted average remaining contractual term, exercisable at the end of period 2 years 8 months 9 days