XML 36 R25.htm IDEA: XBRL DOCUMENT v3.23.3
Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense Related to Stock Options

The following table summarizes stock-based compensation expense related to stock options, restricted stock awards (RSAs) granted to employees, non-employee directors and consultants, and the 2019 Employee Stock Purchase Plan (the 2019 ESPP) included in the condensed consolidated statements of operations as follows (in thousands):

 

   2023   2022   2023   2022 
   Three Months Ended
September 30,
   Nine Months Ended
September 30,
 
   2023   2022   2023   2022 
                 
Research and development  $30    150   $99    491 
Selling and marketing   42    144    146    459 
General and administrative   186    687    698    2,179 
Total  $258   $981   $943   $3,129 
Schedule of Weighted Average Assumptions

 

   Three and Nine months ended September 30, 
   2022 
Expected volatility   177.2%
Risk-free interest rate   2.3%
Expected dividend yield   0.0%
Expected term (years)   0.5