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Leases - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jan. 21, 2020
renewal_term
Nov. 30, 2016
ft²
renewal_term
Oct. 31, 2014
renewal_term
May 31, 2013
ft²
renewal_term
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Jul. 01, 2019
USD ($)
Jun. 01, 2018
ft²
Feb. 28, 2015
ft²
Leases [Line Items]                    
Cash payments for operating leases | $         $ 96   $ 288      
Cash payments for financing leases | $         $ 1   $ 1      
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]                    
Lease, expiration date Apr. 30, 2021                  
Lessee, Operating Lease, Existence of Option to Extend [true false] true                  
Number of renewal terms | renewal_term 1                  
Renewal term 1 year                  
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 | 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