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Acquisitions - Summary of Fair Value of Aggregate Consideration Paid or Payable (Parenthetical) (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 06, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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 | 3,388,000 | $ 3,400,000 |  |  | $ 3,400,000
Increase to contingent consideration |  | $ 400,000 |  |  |
FeedbackNow [Member] | Provisional Fair Value [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent purchase price | $ 3,000,000 |  |  |  |
FeedbackNow [Member] | Level 3 [Member] | Contingent Consideration [Member] | Discount Rate [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of contingent consideration dicount rate | 23.7 | 23.8 |  |  | 23.8
FeedbackNow [Member] | Level 3 [Member] | Contingent Consideration [Member] | Revenue Volatility [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of contingent consideration dicount rate | 20.8 | 21.9 |  |  | 21.9
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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