Accrued Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Expense
Accrued expense	$ 673	$ 740
Accrued Vacation And Bonus	400	100
Accrued Clinical And Preclinical Expenses	200	500
Other Accrued Liabilities	$ 100
Accrued Legal And Professional Fee		$ 100