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1. Summary of Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Stock based compensation costs $ 663 $ 1,700 $ 2,816 $ 4,266  
Unrecognized stock-based compensation costs 4,300   $ 4,300    
Unrecognized stock-based compensation costs amortization period     2 years 2 months 12 days    
Aggregate intrinsic value outstanding 7,700   $ 7,700    
Aggregate intrinsic value exercisable $ 7,200   $ 7,200    
Options Exercised     315,000 618,773  
Total intrinsic value of options exercised     $ 869 $ 1,800  
Shares available for future grants 2,893,000   2,893,000    
Warrants [Member]          
Warrants outstanding 0   0   2,000,000
Warrants exercised     1,999,995    
Stock issued from warrant exercises     5    
Common Stock [Member]          
Stock issued from warrant exercises     1,999,995