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23. Stock-based Compensation (Details - Options by Exercise Price)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Shares Exercisable | shares 76,900
Aggregate Intrinsic Value (in Dollars) | $ $ 0
$118-$172 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower exercise price per share (in dollars per share) $ 118
Upper exercise price per share (in dollars per share) $ 172
Shares Exercisable | shares 750
Weighted average remaining contractual life 7 years 1 month 16 days
Weighted average exercise price $ 172
Aggregate Intrinsic Value (in Dollars) | $ $ 0
$40 - $117 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower exercise price per share (in dollars per share) $ 40
Upper exercise price per share (in dollars per share) $ 117
Shares Exercisable | shares 28,200
Weighted average remaining contractual life 8 years 4 months 20 days
Weighted average exercise price $ 64
Aggregate Intrinsic Value (in Dollars) | $ $ 0
$2 - $39 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower exercise price per share (in dollars per share) $ 2
Upper exercise price per share (in dollars per share) $ 39
Shares Exercisable | shares 47,950
Weighted average remaining contractual life 9 years 6 months 29 days
Weighted average exercise price $ 6
Aggregate Intrinsic Value (in Dollars) | $ $ 0