Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2021 USD ($)
Product Liability Contingency [Line Items]
Other Commitment, Due in Next Twelve Months	$ 1.6
Drug Supplier Project Plan [Member]
Product Liability Contingency [Line Items]
Other Commitment	2.1
Manufacture of Prexigebersen [Member]
Product Liability Contingency [Line Items]
Other Commitment	1.0
Manufacture of Drug Substance [Member]
Product Liability Contingency [Line Items]
Other Commitment	0.9
Manufacturing Development [Member]
Product Liability Contingency [Line Items]
Other Commitment	0.1
Testing Services [Member]
Product Liability Contingency [Line Items]
Other Commitment	$ 0.1