Quarterly report pursuant to Section 13 or 15(d)

Share-based Compensation (Tables)

v3.21.2
Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Compensation [Abstract]  
Share-Based Compensation Expense
Share-based compensation expense was included in general and administrative and research and development costs as follows in the accompanying condensed consolidated statements of comprehensive loss for the three and nine month periods indicated below (in thousands):
 
 
 
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
 
 
2021
   
2020
   
2021
   
2020
 
General and administrative
 
$
322
   
$
224
   
$
804
   
$
426
 
Research and development
   
156
     
392
     
631
     
567
 
Total share-based compensation
 
$
478
   
$
616
   
$
1,435
   
$
993
 
Weighted Average Assumptions Used in Black-Scholes Option-pricing Model
The weighted‑average assumptions used in the Black-Scholes option-pricing model are as follows during the three and nine months ended September 30, 2021 and 2020:

 
 
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
 
 
2021
   
2020
   
2021
   
2020
 
Expected stock price volatility
   
99.7
%
   
87.6
%
   
98.0
%
   
94.8
%
Expected life of options (years)
   
5.8
     
10.0
     
5.8
     
10.0
 
Expected dividend yield
   
0
%
   
0
%
   
0
%
   
0
%
Risk free interest rate
   
0.9
%
   
0.7
%
   
0.9
%
   
0.7
%