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7. Shareholders' Equity (Details - Option activity)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Shares  
Options outstanding at the beginning of period | shares 13,135
Granted | shares 1,720
Exercised | shares (315)
Forfeited/Expired | shares (119)
Options outstanding at the end of period | shares 14,421
Options exercisable at the end of period | shares 8,789
Weighted Average Exercise Price  
Options outstanding at the beginning of period | $ / shares $ 4.66
Granted | $ / shares 3.49
Exercised | $ / shares 1.53
Forfeited/Expired | $ / shares 7.2
Options outstanding at the end of period | $ / shares 4.57
Options exercisable at the end of period | $ / shares $ 4.76
Weighted Average Remaining Contractual Term  
Weighted average remaining contractual term, end of period 3 years 10 months 28 days
Weighted average remaining contractual term, exercisable at the end of period 3 years 5 months 1 day