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Accrued Liabilities
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities as of December 31, 2020 and 2019 consisted of the following (table in thousands):
20202019
Accrued Research & Development Expense$232 $283 
Accrued Compensation and Benefits2,500 1,108 
Accrued Unvouchered Receipts755 1,901 
Accrued Workers Compensation395 195 
Other Accrued Liabilities1,131 1,031 
Total Accrued Liabilities$5,013 $4,518