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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities    
Accrued compensation and other payroll liabilities $ 92 $ 137
Legal costs 52 106
Accrued interest   43
Non-operating transactional costs 176  
Other research and development expenses 66 135
Other general and administrative expenses 10 17
Total $ 396 $ 438