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Acquisitions - Summary of Fair Value of Aggregate Consideration Paid or Payable (Parenthetical) (Detail) - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 06, 2018 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Net cash paid |  | $ 9,250,000 |  |
FeedbackNow [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash acquired | $ 500,000 |  |  |
Net cash paid | 8,000,000 |  |  |
Holdback amount expected to be paid | 1,485,000 |  |  |
Business acquisition undiscounted amounts could be payable, minimum | 0 |  |  |
Business acquisition undiscounted amounts could be payable, maximum | 4,200,000 |  |  |
Contingent purchase price | $ 3,015,000 |  |  |
FeedbackNow [Member] | Scenario Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Holdback amount expected to be paid |  |  | $ 1,000,000 | $ 500,000
FeedbackNow [Member] | Maximum [Member] | Scenario Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Additional consideration payable to sellers based on financial performance |  |  | $ 2,500,000 | $ 1,700,000

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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