Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other current assets	$ 928	$ 788
Prepaid Expenses [Member]
Other current assets	900	800
Prepaid Expenses [Member] | Acute Myeloid Leukemia [Member]
Other current assets		600
Prepaid Expenses [Member] | Acute Myeloid Leukemia And Chronic Myelogenous Leukemia [Member]
Other current assets	600
Prepaid insurance	$ 300
Other Prepaid Expenses [Member]
Other current assets		$ 200