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Accrued Liabilities (Tables)
 9 Months Ended
Sep. 30, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities as of September 30, 2021 and December 31, 2020 consisted of the following (table in thousands):
September 30,
2021		December 31,
2020
Accrued Research & Development Expense$181 $232 
Accrued Compensation and Benefits2,193 2,500 
Accrued Unvouchered Receipts622 755 
Accrued Workers Compensation434 395 
Other Accrued Liabilities941 1,131 
Total Accrued Liabilities$4,371 $5,013