Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other Assets, Current	$ 845	$ 803
Prepaid Insurance	300	100
Acute Myeloid Leukemia [Member]
Other Assets, Current	400	600
Prepaid Expenses [Member]
Other Assets, Current	800	800
Other Prepaid Expenses [Member]
Other Assets, Current	$ 100	$ 100