Subsequent Events (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Mar. 31, 2019	Jan. 31, 2019
Subsequent Event [Line Items]
Other commitment		$ 38,832
Enterprise Partnership Arrangement
Subsequent Event [Line Items]
Other commitment		$ 36,000
Commitment term		3 years
Subsequent Event \| Enterprise Partnership Arrangement
Subsequent Event [Line Items]
Other commitment	$ 219,000
Commitment term	5 years

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