Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions	1 Months Ended
Jan. 31, 2019	Feb. 28, 2019
Subsequent Events
Reduction in deferred tax assets		$ (11.5)
Site visit duration	6 months

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