Revenue from contracts with customers (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue	$ 426	$ 498	$ 427	$ 481
Deferred Revenue, Additions	235	252
Deferred Revenue, Revenue Recognized	$ 235	$ 235

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

No definition available.

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