Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other prepaid expenses		$ 1,300
Other current assets	$ 1,843	928
Prepaid Expenses [Member]
Other current assets	1,800	900
Prepaid Expenses [Member] | BP1002 in lymphoma, prexigebersen in AML and prexigebersen-A [Member]
Other current assets		600
Prepaid Expenses [Member] | Acute Myeloid Leukemia And Chronic Myelogenous Leukemia [Member]
Other current assets	1,400
Prepaid insurance	300
Other Prepaid Expenses [Member] | Acute Myeloid Leukemia [Member]
Other prepaid expenses	$ 100
Other Prepaid Expenses [Member] | BP1002 in lymphoma, prexigebersen in AML and prexigebersen-A [Member]
Prepaid insurance		$ 300