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Summary of Significant Accounting Policies - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) Customer $ / shares shares | Dec. 31, 2020 USD ($) Customer $ / shares shares | Dec. 31, 2019 USD ($) Customer shares | Dec. 31, 2018 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Short-term investments | $ 0 | $ 0 | $ 108,919,000 |
Purchases of digital assets, amount | $ 1,125,000,000 | 1,125,000,000 | 0 | $ 0
Additions to capitalized software development costs |  | 0 | 0 | 0
Capitalized computer software, amortization |  | $ 0 | 0 | 2,500,000
Payment terms |  | The Company’s standard payment terms are generally within 180 days of invoicing. If extended payment terms are granted to customers, those terms generally do not exceed one year. |  |
Description of warranty |  | The standard software assurance warranty period is generally less than one year. |  |
Amortization period for capitalized contract costs | 3 years | 3 years |  |
Product support period |  | 1 year |  |
Capitalized cost to obtain customer contracts net | $ 6,100,000 | $ 6,100,000 | 4,800,000 |
Advertising costs |  | 100,000 | 900,000 | 7,100,000
Prepaid advertising costs | $ 0 | $ 0 | $ 0 |
Common stock, conversion ratio |  | one |  |
Preferred stock, shares outstanding | shares | 0 | 0 | 0 |
Cumulative foreign currency translation amount | $ (3,900,000) | $ (3,900,000) | $ (9,800,000) | (9,800,000)
Foreign currency translation adjustments, tax |  | 0 | 0 | 0
Transaction gains (losses) arising from transactions denominated in foreign currencies |  | $ (7,600,000) | $ (1,000,000.0) | $ 4,700,000
Customer Concentration Risk | Sales Revenue, Goods, Net |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of individual customer accounted for 10% or more of net accounts receivable | Customer | 0 | 0 | 0 |
Number of individual customer accounted for 10% or more of total revenues | Customer |  | 0 | 0 | 0
Class A |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Common stock, voting rights, per share |  | one |  |
Class A | Convertible Debt |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Common stock, convertible, conversion price | $ / shares | $ 397.99 | $ 397.99 |  |
Class B Convertible |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Common stock, voting rights, per share |  | ten |  |
Sales and Marketing |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Amortization expenses related to capitalized cost |  | $ 3,100,000 | $ 2,900,000 | $ 2,300,000
Computer Equipment And Purchased Software |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets, years |  | 3 years |  |
Office Equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets, years |  | 5 years |  |
Office Furniture |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets, years |  | 10 years |  |
Corporate Aircraft |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets, years |  | 19 years |  |
Estimated salvage value | 21.00% | 21.00% |  |
Software Development |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of assets, years |  | 3 years |  |

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