Commitments and Contingencies (Details) - Mar. 31, 2019 € in Millions, $ in Millions	EUR (€)	USD ($)
Collaborations and Manufacturing Commitments
Potential milestone payable		$ 80.0
Manufacturing commitments
Collaborations and Manufacturing Commitments
Manufacturing commitment	€ 28	$ 1.4

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant