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Summary of Fair Values of Assets Acquired and Liabilities Assumed at Acquisition (Detail) - USD ($)
 3 Months Ended
Nov. 01, 2018
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Jan. 02, 2019
Business Acquisition [Line Items]          
Goodwill     $ 10,138,000 $ 10,238,000  
Purchase price net of cash acquired   $ 1,287,000      
Thursby Software Systems          
Business Acquisition [Line Items]          
Cash $ 3,485,000        
Accounts receivable 526,000        
Inventory 1,297,000        
Prepaid expenses and other current assets 12,000        
Finite-lived intangibles 2,400,000        
Total identifiable assets acquired 7,720,000        
Accounts payable (31,000)        
Accrued expenses and liabilities (67,000)        
Deferred revenue (243,000)        
Earnout consideration liability       0  
Other current liabilities (4,307,000)        
Total liabilities assumed (4,648,000)        
Net identifiable assets acquired 3,072,000        
Goodwill 3,554,000        
Purchase price 6,626,000        
Less: cash acquired (3,485,000)        
Purchase price net of cash acquired 3,141,000        
Thursby Software Systems | Trademarks          
Business Acquisition [Line Items]          
Finite-lived intangibles 200,000        
Thursby Software Systems | Customer Relationships          
Business Acquisition [Line Items]          
Finite-lived intangibles 1,500,000        
Thursby Software Systems | Developed Technology          
Business Acquisition [Line Items]          
Finite-lived intangibles $ 700,000        
Viscount Systems, Inc.          
Business Acquisition [Line Items]          
Accounts receivable         $ 636,000
Inventory         249,000
Prepaid expenses and other current assets         29,000
Property and equipment         190,000
Operating lease ROU assets         550,000
Finite-lived intangibles         1,670,000
Total identifiable assets acquired         3,324,000
Accounts payable         (372,000)
Operating lease liabilities         (61,000)
Accrued expenses and liabilities         (120,000)
Deferred revenue         (34,000)
Earnout consideration liability   $ (750,000)   $ (750,000) (200,000)
Other current liabilities         (326,000)
Long-term operating lease liabilities         (489,000)
Total liabilities assumed         (1,602,000)
Net identifiable assets acquired         1,722,000
Goodwill         1,200,000
Purchase price         2,922,000
Viscount Systems, Inc. | Trademarks          
Business Acquisition [Line Items]          
Finite-lived intangibles         160,000
Viscount Systems, Inc. | Customer Relationships          
Business Acquisition [Line Items]          
Finite-lived intangibles         710,000
Viscount Systems, Inc. | Developed Technology          
Business Acquisition [Line Items]          
Finite-lived intangibles         $ 800,000