v3.19.1
Acquisition of Unitron - Summary of Purchase Price Allocated to Net Assets Acquired in Transaction (Detail) - USD ($)
Aug. 17, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Goodwill   $ 5,936,000
Unitron Assets [Member]    
Business Acquisition [Line Items]    
Cash $ 18,000  
Accounts receivable 27,000  
Inventory 1,243,000  
Other current assets 601,000  
Property and equipment 332,000  
Intangibles 76,000  
Goodwill 4,399,000  
Other assets 41,000  
Accounts payable (2,169,000)  
Notes payable (868,000)  
Total net assets acquired $ 3,700,000