Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2013 ft² renewal_term	Jun. 30, 2018 USD ($) ft² renewal_term	Jun. 30, 2017 USD ($)	Jun. 01, 2018 ft²	Jul. 31, 2015 ft²	Feb. 28, 2015 ft²
Operating Leased Assets [Line Items]
Rent expense | $		$ 0.4	$ 0.4
Original lease area of land removed				8,118
Leased premises remaining area				17,560
1st Detect
Operating Leased Assets [Line Items]
Number of renewal terms | renewal_term		2
Renewal term		5 years
Leased premises, right of first refusal exercised						9,138
Austin, Texas
Operating Leased Assets [Line Items]
Leased premises		5,219
Number of renewal terms | renewal_term		1
Renewal term		5 years
Period before expiration of lease that renewal contract must be signed		8 months
Austin, Texas | Astral Images, Inc
Operating Leased Assets [Line Items]
Leased premises					4,000
Webster Texas Property | 1st Detect | Research and Development and Production Facility
Operating Leased Assets [Line Items]
Leased premises	16,540
Number of renewal terms | renewal_term	2
Renewal term	5 years
Lease term	62 months