Accrued Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Disclosure Accrued Expense
Accrued expense	$ 555	$ 740
Accrued Vacation And Bonus	200	100
Accrued Clinical And Preclinical Expenses	300	500
Other Accrued Liabilities	$ 100
Accrued Legal And Professional Fee		$ 100