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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Employee compensation and benefits $ 452 $ 620
Leased facilities 71 188
Professional services 264 235
Field trials and related expenses 97 52
Other 252 202
Total accrued expenses $ 1,136 $ 1,297