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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2022 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of operating segments | segment |  | 1 |  |  |  |  |  |
Foreign currency transaction gains (losses) |  | $ (943,000) | $ 1,755,000 | $ 2,572,000 |  |  |  |
Cash equivalents |  | 30,200,000 | 5,200,000 |  |  |  |  |
Restricted cash equivalent balance |  | 0 | 25,000,000 | 25,000,000 |  |  | $ 25,000,000 |
Personal loan |  |  | 50,000,000 |  |  |  | $ 50,000,000 |
Reclassification of restricted cash equivalent to unrestricted cash equivalent |  |  |  |  |  | $ 25,000,000 |  |
Other than temporary impairment of available for sale debt security recognized in statement of operations |  |  | 4,900,000 |  |  |  |  |
Other than temporary impairment of available for sale debt security recognized in other comprehensive loss |  |  | 94,000 |  |  |  |  |
Loss on debt extinguishment |  | 7,748,000 | 0 | 0 |  |  |  |
Capitalized deferred offering costs | $ 5,600,000 | 5,636,000 | 0 | 0 |  |  |  |
Total stockholders’ equity (deficit) |  | 197,551,000 | (550,632,000) | (556,991,000) |  |  |  | $ (556,535,000)
Advertising expense |  | $ 195,400,000 | 119,200,000 | 67,200,000 |  |  |  |
Forecast |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Operating lease assets |  |  |  |  | $ 5,000,000 |  |  |
Operating lease liabilities |  |  |  |  | $ 7,000,000 |  |  |
Minimum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Remaining Weighted average useful life (in years) |  | 2 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Remaining Weighted average useful life (in years) |  | 6 years |  |  |  |  |  |
Purchased and internal-use software |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  | 3 years |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity (deficit) |  |  |  |  |  |  |  | $ 996,000
Cost of revenue |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Filing fees |  | $ 79,800,000 | 64,500,000 | 50,700,000 |  |  |  |
Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Other than temporary impairment of available for sale debt security recognized in statement of operations |  |  | 4,800,000 |  |  |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred offering costs non current |  | 0 | 0 | $ 3,700,000 |  |  |  |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred cost of revenue |  | $ 1,800,000 | $ 2,000,000 |  |  |  |  |
Customer One | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  | 20.00% |  |  |  |  |
Outside United States | Revenue Benchmark | Geographic Concentration Risk |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  | 1.00% | 1.00% | 4.00% |  |  |  |
Outside United States | Property, Plant and Equipment | Geographic Concentration Risk |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property plant and equipment percent |  | 1.00% | 1.00% |  |  |  |  |

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