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Employee Termination Benefits
9 Months Ended
Sep. 30, 2021
Postemployment Benefits [Abstract]  
Employee Termination Benefits Employee Termination Benefits
During the three-month period ended September 30, 2021, no employees received termination benefits. Certain employees received termination benefits including cash severance and accelerated share-based compensation upon separation of service from the Company as a result of the sale of North Park assets and other employee terminations during the nine-month period ended September 30, 2021 and as a result of a reduction in workforce during the three and nine-month periods ended September 30, 2020. The following tables presents a summary of employee termination benefits for the three and nine-month periods ended September 30, 2021 and 2020 (in thousands):

CashShare-Based Compensation (1)Number of SharesTotal Employee Termination Benefits
Three Months Ended September 30, 2021
Executive Employee Termination Benefits $— $— — $— 
Other Employee Termination Benefits — — — — 
$— $— — $— 
Three Months Ended September 30, 2020
Executive Employee Termination Benefits
$1,005 $1,784 159 $2,789 
Other Employee Termination Benefits
395 — — 395 
$1,400 $1,784 159 $3,184 
Nine Months Ended September 30, 2021
Executive Employee Termination Benefits$— $— — $— 
Other Employee Termination Benefits32 17 — 49 
$32 $17 — $49 
Nine Months Ended September 30, 2020
Executive Employee Termination Benefits$1,009 $1,784 159 $2,793 
Other Employee Termination Benefits5,598 40 5,638 
$6,607 $1,824 163 $8,431 


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(1)    Share-based compensation recognized in connection with the accelerated vesting of restricted stock awards due to the sale of the North Park assets for the nine-month period ended September 30, 2021 and as a result of the reduction in workforce for the three and nine-month periods ended September 30, 2020. The remaining unrecognized compensation expense associated with these awards at the date of termination was recorded as employee termination benefits. The unrecognized compensation expense was calculated using the grant date fair value for restricted stock awards. One share of the Company’s common stock was issued per restricted stock award.