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Accrued Liabilities
 3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities as of March 31, 2021 and December 31, 2020 consisted of the following (table in thousands):
March 31,
2021		December 31,
2020
Accrued Research & Development Expense$331 $232 
Accrued Compensation and Benefits1,334 2,500 
Accrued Unvouchered Receipts661 755 
Accrued Workers Compensation436 395 
Other Accrued Liabilities1,270 1,131 
Total Accrued Liabilities$4,032 $5,013