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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Customers shares | Dec. 31, 2019 USD ($) Customers | Jan. 01, 2020 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Restricted Cash | $ 300,000 | $ 300,000 |
Deferred revenue | 1,900,000 | 1,500,000 |
Contract with customer, liability, revenue recognized | 1,100,000 |  |
Advertising expenses | 238,300,000 | 175,500,000 |
Allowance for doubtful accounts | 100,000 | 0 |
Write off against reserve |  | 500,000 |
Impairment loss | 0 | $ 0 |
Operating lease right to asset | 9,621,000 |  |
Operating lease liability | 10,686,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Operating lease right to asset |  |  | $ 9,700
Operating lease liability |  |  | $ 10,900
Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Write off against reserve | $ 100,000 |  |
Crosspointe Insurance and Financial Services LLC [Member] | Common Class A [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Acquisition contingent consideration target years | 3 years |  |
Crosspointe Insurance and Financial Services LLC [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Contingent consideration payable in common stock, shares | shares | 97,922 |  |
Software [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | $ 15,800,000 |  |
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 | 22.00% | 21.00% |
Accounts Receivable [Member] | Credit Concentration Risk [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Number of major customers | Customers | 1 | 2 |
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customers A [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage | 12.00% | 14.00% |
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customers B [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 14.00% |

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