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7. STOCKHOLDERS' EQUITY (Details 1)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Shares  
Outstanding at beginning of period | shares 5,630,351
Forfeited | shares (29,087)
Expired | shares (4,852)
Granted | shares 1,158,900
Exercised | shares (1,958)
Outstanding at end of period | shares 6,753,354
Options exercisable | shares 3,780,306
Weighted Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 4.76
Forfeited | $ / shares 3.65
Expired | $ / shares 4.60
Granted | $ / shares 2.96
Exercised | $ / shares 3.67
Outstanding at end of period | $ / shares 4.46
Options exercisable | $ / shares $ 5.29