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Fair Value Measurements - Additional Information (Detail) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Jan. 02, 2019
Fair Value Measurements, Non-recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liability measured and recognized at fair value $ 0 $ 0    
Fair Value Measurements, Non-recurring | Fair Value, Level 3        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Privately-held investments measured at fair value $ 348,000 348,000    
Viscount Systems, Inc.        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value of earnout consideration   750,000 $ 750,000 $ 200,000
Thursby Software Systems        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value of earnout consideration   $ 0