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Fair Value Measurements - Additional Information (Detail) - USD ($) | Mar. 31, 2019 | Jan. 02, 2019 | Dec. 31, 2018
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Viscount Systems, Inc. |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value of earn out consideration | $ 200,000 | $ 200,000 |
3VR and Thursby |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value of earn out 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 | $ 300,000 |  | $ 300,000

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