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Summary of Changes in Carrying Amount of Goodwill (Detail) (Parenthetical) | 12 Months Ended
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Dec. 31, 2020 USD ($)
Goodwill [Line Items] |  |
Adjustment to goodwill | $ 84,000 | [1]
Sonar Acquisition |  |
Goodwill [Line Items] |  |
Total consideration | 13,200,000 |
Adjustment to goodwill | $ 84,000 |
[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.

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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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