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Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |  |
Balance as of December 31, 2019 |  | $ 32,330 | $ 32,330 |
Adjustment to goodwill | [1] |  | (84) |
Impairment of goodwill |  | $ (14,700) | (14,688) | [2]
Balance as of December 31, 2020 |  |  | $ 17,558 |
[1] | (1) Included working capital adjustments finalized subsequent to the Sonar acquisition in December 2019, resulting in total consideration of approximately $13.2 million and an adjustment to goodwill in the amount of $84,000 during the year ended December 31, 2020.
[2] | (2) The impairment is recorded on the Company's Consolidated Statement of Operations within Impairment of goodwill.

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