Commitments and contingencies - Narrative - Contingencies (Details) $ in Thousands			1 Months Ended	12 Months Ended
	Nov. 22, 2017 patent	Jan. 12, 2017 USD ($)	Jan. 31, 2017 USD ($)	Jun. 30, 2019 USD ($) settlement_agreement	Jun. 30, 2018 USD ($)		Jun. 30, 2017 USD ($)	[1]	Jun. 30, 2016 USD ($)	Aug. 31, 2017 pending_and_settled_claim
Loss Contingencies [Line Items]
Legal settlement and contingencies				$ 700	$ 425	[1]	$ 6,424
Number of litigation settlement agreements | settlement_agreement				2
Increase (decrease) in other accrued liabilities			$ (726)
Indemnification Agreement
Loss Contingencies [Line Items]
Amount awarded to other party					250
Number of claims settled and pending claims | pending_and_settled_claim										5
Vehicle IP, LLC | Indemnification Agreement
Loss Contingencies [Line Items]
Accrual related to litigation									$ 850
Legal settlement and contingencies		$ 8,000
Amount awarded to other party		$ 7,200
Location Based Services LLC | Pending Litigation
Loss Contingencies [Line Items]
Legal settlement and contingencies					$ 250
Number of patents allegedly infringed | patent	15

[1] See Note 1 for a summary of adjustments.