Prepaid Drug Product (Details) - Prexigebersen - Prepaid Drug Product - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Prepayments for clinical trials		$ 3.6
Advanced payments not yet expensed	$ 0.6

Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Name:	us-gaap_Supplies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant