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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities as of December 31, 2021 and 2020 consisted of the following (table in thousands):
20212020
Accrued Research & Development Expense$366 $232 
Accrued Compensation and Benefits1,791 2,500 
Accrued Unvouchered Receipts796 755 
Accrued Workers Compensation382 395 
Other Accrued Liabilities1,755 1,131 
Total Accrued Liabilities$5,090 $5,013