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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities    
Construction in progress $ 73  
Payroll and related benefits 1,173 $ 1,008
Clinical trial costs 1,702 271
Operating expenses 1,769 719
Financing costs 1 284
Office lease 135 127
Interest 18 2
Total accrued liabilities $ 4,871 $ 2,411