Post-effective amendment to a registration statement that is not immediately effective upon filing

Stock Options - Stock options outstanding (Details)

v3.21.1
Stock Options - Stock options outstanding (Details)
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Options outstanding, shares 1,672,938
Options oustanding, weighted average remaining years 9 years 2 months 5 days
Options outstanding, weighted average exercise price | $ / shares $ 2.12
Options exercisable, shares 336,397
Options exercisable, weighted average exercise price | $ / shares $ 2.47
$1.84[Member]  
Exercise price per share | $ / shares $ 1.84
Options outstanding, shares 648,000
Options oustanding, weighted average remaining years 9 years 4 months 8 days
$2.03[Member]  
Exercise price per share | $ / shares $ 2.03
Options outstanding, shares 659,000
Options oustanding, weighted average remaining years 9 years 5 months 1 day
Options exercisable, shares 158,167
$2.62[Member]  
Exercise price per share | $ / shares $ 2.72
Options outstanding, shares 50,000
Options oustanding, weighted average remaining years 9 years 6 months 7 days
$2.72[Member]  
Exercise price per share | $ / shares $ 2.80
Options outstanding, shares 25,000
Options oustanding, weighted average remaining years 5 years 2 months 5 days
Options exercisable, shares 25,000
$2.80[Member]  
Exercise price per share | $ / shares $ 2.96
Options outstanding, shares 220,625
Options oustanding, weighted average remaining years 8 years 4 months 8 days
Options exercisable, shares 82,917
$2.96[Member]  
Options outstanding, shares 70,313
Options oustanding, weighted average remaining years 8 years 2 months 7 days
Options exercisable, shares 70,313