Subsequent Events Subsequent Events (Details Textual) - Subsequent Event $ in Millions	1 Months Ended
Jul. 31, 2018 USD ($)
Subsequent Event [Line Items]
Upfront payment for asset acquisition	$ 27.5
AliveGen
Subsequent Event [Line Items]
Estimated additional payments upon achievement of milestones	$ 535.0

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