Basis of Presentation (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Provision for Inventory Write-Down
Reclassification adjustment to prior year amounts	$ 582

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration