XML 22 R13.htm IDEA: XBRL DOCUMENT v3.22.1
Accrued Expenses
3 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consist of the following (in thousands):
 March 31,December 31,
 20222021
Payroll and employee related expenses$1,116 $3,179 
Accrued patent fees711 309 
Accrued external research and development costs4,973 4,339 
Accrued professional and consulting services1,560 815 
Accrued interest179 170 
Other350 1,721 
Accrued expenses$8,889 $10,533 
Other accrued expenses as of March 31, 2022 and December 31, 2021 include a $0.9 million estimated liability for the settlement of litigation relating to the two lawsuits described further within Note 17.