XML 37 R27.htm IDEA: XBRL DOCUMENT v3.23.1
Stock-Based Compensation (Tables)
6 Months Ended
Mar. 31, 2023
Stock-Based Compensation [Abstract]  
Schedule of stock-based compensation expense
   Three Months Ended   Six Months Ended 
   March 31,   March 31, 
   2023   2022   2023   2022 
Selling, general and administrative  $199,467   $194,874   $454,932   $357,875 
Research and development   38,161    37,842    82,877    77,913 
Total stock-based compensation expense  $237,628   $232,716   $537,809   $435,788 

 

Schedule of weighted-average assumptions used in the Black-Scholes option-pricing model
   Three Months Ended   Six Months Ended 
   March 31,   March 31, 
   2023   2022   2023   2022 
Expected stock price volatility   58.1%   53.5%   55.5%   53.5%
Expected life of options (years)   5.3    6.1    5.2    6.1 
Expected dividend yield   0%   0%   0%   0%
Risk free interest rate   3.7%   1.6%   3.9%   1.6%