Subsequent Events (Details) $ in Millions	Jan. 31, 2020 USD ($)
Subsequent Event \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Firdapse
Subsequent Event [Line Items]
Consideration received	$ 67.0

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration