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Accrued Expenses
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consist of the following:
Year ended December 31,
20212020
Employee compensation and benefits$452 $620 
Leased facilities71 188 
Professional services264 235 
Field trials and related expenses97 52 
Other252 202 
Total accrued expenses$1,136 $1,297