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7. Shareholders' Equity (Details - Option activity)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Number of Shares  
Options outstanding at the beginning of period | shares 12,595
Granted | shares 1,470
Exercised | shares (647)
Forfeited/Expired | shares (283)
Options outstanding at the end of period | shares 13,135
Options exercisable at the end of period | shares 8,789
Weighted Average Exercise Price  
Options outstanding at the beginning of period | $ / shares $ 4.56
Granted | $ / shares 4.35
Exercised | $ / shares 1.68
Forfeited/Expired | $ / shares 5.62
Options outstanding at the end of period | $ / shares 4.66
Options exercisable at the end of period | $ / shares $ 4.51
Weighted Average Remaining Contractual Term  
Weighted average remaining contractual term, end of period 4 years 5 months 12 days
Weighted average remaining contractual term, exercisable at the end of period 4 years 14 days