Accrued Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Expense
Accrued expense	$ 410	$ 673
Accrued Vacation And Bonus	200	400
Accrued Legal And Patent Fees	100
Other Accrued Liabilities	$ 100	100
Accrued Clinical And Preclinical Expenses		$ 200