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Acquisition - Summary of Estimated Fair Value of Acquisition-Related Liabilities (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Change in fair value |  | $ (941,000) | $ (941,000)
Sonar Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Contingent consideration | $ 1,016,000 |  |
(Level 3) |  |  |
Business Acquisition [Line Items] |  |  |
Balance |  | 1,584,000 | 1,509,000
Change in fair value |  | $ (1,584,000) | (941,000)
Balance | $ 1,584,000 |  | 1,584,000
(Level 3) | Sonar Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Contingent consideration |  |  | $ 1,016,000

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