Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Assets, Current	$ 1,277	$ 788
Prepaid Expenses [Member]
Other Assets, Current	1,300	800
Prepaid Insurance		200
Prepaid Expenses [Member] | At-The-Market Offering Agreement [Member]
Other Assets, Current	200
Prepaid Expenses [Member] | BP1002 in lymphoma and prexigebersen-A [Member]
Other Assets, Current	500
Prepaid Insurance	400
Prepaid Expenses [Member] | BP1003 Manufacturing Activities [Member]
Prepaid Insurance	100
Prepaid Expenses [Member] | AcuteMyeloidLeukemia and Chronic Myelogenous Leukemia [Member]
Other Assets, Current		$ 600
Other Prepaid Expenses [Member]
Other Assets, Current	$ 100