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Fair Value Measurements - Additional Information (Detail) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Jan. 02, 2019
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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 |  |

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