Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Product Warranty Liability [Line Items]
Product warranty term	12 months
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 1,691	$ 1,523	$ 1,974
Accruals for warranties issued during the period	1,318	1,328	1,976
Settlements made during the period	(1,790)	(1,366)	(2,541)
Ending Balance	1,336	1,691	1,523
Themis
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	117	0	0
CES Creative Electronic Systems S.A.
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	0	176	0
Delta
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	0	30	0
Carve-Out Business
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Warranty assumed from CES	$ 0	$ 0	$ 114