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Fair Value Measurements - Additional Information (Detail) - USD ($)
Sep. 30, 2019
Mar. 31, 2019
Jan. 02, 2019
Dec. 31, 2018
Viscount Systems, Inc.        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value of earnout consideration $ 375,000 $ 200,000 $ 200,000  
3VR and Thursby        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value of earnout consideration 0      
Fair Value, Measurements, Recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Asset 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 $ 368,000     $ 368,000