Inventory (Details Textual) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Bioverativ
Inventory [Line Items]
Inventory sold to Bioverativ, cost	$ 173.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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