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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 01, 2020 shares | Mar. 31, 2021 USD ($) Customers shares | Mar. 31, 2020 USD ($) Customers | Dec. 31, 2020 USD ($) Customers
Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue |  | $ 1.8 |  | $ 1.9
Contract with customer, liability, revenue recognized |  | 1.2 |  |
Advertising expenses |  | 72.4 | $ 57.5 |
Write off against reserve |  |  |  | $ 0.1
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Write off against reserve |  | $ 0.1 |  |
Crosspointe Insurance and Financial Services LLC [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Contingent consideration payable in common stock, shares | shares | 97,922 | 97,922 |  |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash equivalents |  | $ 46.9 |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of major customers | Customers |  | 1 | 1 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customers A [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage |  | 20.00% | 24.00% |
Accounts Receivable [Member] | Credit Concentration Risk [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of major customers | Customers |  | 1 |  | 1
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customers A [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage |  | 17.00% |  | 12.00%

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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