v3.20.1
Acquisition of Unitron - Summary of Purchase Price Allocated to Net Assets Acquired in Transaction (Detail) - USD ($)
Dec. 31, 2019
Aug. 17, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 699,000   $ 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   $ 3,700,000