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Leases - Additional Information (Details) $ in Thousands			1 Months Ended			3 Months Ended	6 Months Ended
	Jan. 21, 2020	Jan. 21, 2020 renewal_term	Nov. 30, 2016 ft² renewal_term	Oct. 31, 2014 renewal_term	May 31, 2013 ft² renewal_term	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	Jun. 01, 2018 ft²	Feb. 28, 2015 ft²
Leases [Line Items]
Adjustment for operating lease right of use asset								$ 414
Adjustment for operating lease liability								$ 414
Incremental borrowing rate						11.00%	11.00%	11.00%
Cash payments						$ 96	$ 191
Weighted-average remaining lease term for operating leases						3 years 1 month 6 days	3 years 1 month 6 days	3 years 1 month 6 days
1st Detect
Leases [Line Items]
Lease, expiration date				Apr. 30, 2020
Lessee, Operating Lease, Existence of Option to Extend [true false]				true
Number of renewal terms | renewal_term				2
Renewal term				5 years
Leased premises, right of first refusal exercised | ft²											9,138
Austin, Texas
Leases [Line Items]
Leased premises | ft²			5,219
Lease, expiration date			Dec. 31, 2023
Lessee, Operating Lease, Existence of Option to Extend [true false]			true
Number of renewal terms | renewal_term			1
Renewal term			5 years
Period before expiration of lease that renewal contract must be signed			8 months
Webster, Texas
Leases [Line Items]
Original lease area of land removed | ft²										8,118
Leased premises remaining area | ft²										17,560
Adjustment for operating lease right of use asset							$ 414
Adjustment for operating lease liability							$ 414
Webster, Texas | Subsequent Event
Leases [Line Items]
Lease, expiration date	Apr. 30, 2021	Apr. 30, 2021
Lessee, Operating Lease, Existence of Option to Extend [true false]	true	true
Number of renewal terms | renewal_term		1
Renewal term	1 year	1 year
Webster, Texas | 1st Detect | Research and Development and Production Facility
Leases [Line Items]
Leased premises | ft²					16,540
Lease, expiration date					Jun. 30, 2018
Lessee, Operating Lease, Existence of Option to Extend [true false]					true
Number of renewal terms | renewal_term					2
Renewal term					5 years
Lease term					62 months
ASU 2016-02
Leases [Line Items]
Cumulative impact of change in accounting policy									$ 230

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Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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Discount rate used by lessee to determine present value of operating lease payments.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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