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13. STOCK-BASED COMPENSATION (Details)
 9 Months Ended
Sep. 30, 2019
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Number of option and warrants outstanding, beginning balance | shares 2,518,000
Number of option and warrants granted and vested | shares 150,000
Number of option and warrants exercised | shares (1,897,000)
Number of option and warrants expired | shares (65,500)
Number of option and warrants outstanding, ending balance | shares 705,500
Weighted-average exercise price of option and warrants, beginning balance | $ / shares $ .97
Weighted-average exercise price of option and warrants granted and vested during the period | $ / shares .91
Weighted-average exercise price of option and warrants exercised | $ / shares .73
Weighted-average exercise price of option and warrants expired | $ / shares 2.31
Weighted-average exercise price of option and warrants, ending balance | $ / shares $ 1.47
Range of exercise price per common share, beginning balance $0.71 - $4.80
Range of exercise price per common share granted and vested $0.91
Range of exercise price per common share exercised $0.73
Range of exercise price per common share expired $2.61
Range of exercise price per common share, ending balance $0.71 - $2.10