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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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Number of major customers representing 10% or more of the Company's accounts receivable.

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Significant Accounting Policies [Line Items]

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of direct write-downs of accounts receivable charged against the allowance.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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