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Acquisition - Additional Information (Detail) - Sonar Acquisition - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Business acquisition, percentage of voting interests acquired | 100.00% |  | 100.00%
Cash paid for business acquisition | $ 8,496 |  |
Indemnification obligations period | 12 months |  |
Identifiable intangible assets |  | $ 5,052 |
Weighted average useful life |  | 4 years 7 months 6 days |
Finite-lived intangible assets, amortization method |  | straight-line method |
Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Stock Issued During Period Shares Acquisitions | 389,000 |  |
Acquired identifiable intangible assets amortization period |  | 60 months |
Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Stock Issued During Period Shares Acquisitions | 0 |  |
Acquired identifiable intangible assets amortization period |  | 24 months |
Class B |  |  |
Business Acquisition [Line Items] |  |  |
Stock Issued During Period Shares Acquisitions | 389,000 |  |
Contingent consideration, description |  |  | Up to 389,000 shares of Class B common stock based upon the achievement of certain financial target goals.
Common stock issued value acquisitions deferred | $ 3,800 |  |
Stock issued during the period, shares | 1,000,000.0 |  |
Common stock issuance period | 3 years |  |
Class B | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Stock Issued During Period Shares Acquisitions | 389,000 |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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