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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) Customer shares | Dec. 31, 2018 USD ($) Customer shares | Dec. 31, 2017 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |
Additions to capitalized software development costs | $ 0 | $ 0 | $ 0
Capitalized computer software, amortization | $ 0 | 2,500,000 | 6,000,000.0
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 |  |
Product support period | 1 year |  |
Capitalized cost to obtain customer contracts net | $ 4,800,000 | 4,200,000 |
Advertising costs | 900,000 | 7,100,000 | 5,700,000
Prepaid advertising costs | $ 0 | $ 0 |
Common stock, conversion ratio | one |  |
Preferred stock, shares outstanding | shares | 0 | 0 |
Cumulative foreign currency translation amount | $ (9,800,000) | $ (9,800,000) | (5,700,000)
Foreign currency translation adjustments, tax | 0 | 0 | 0
Transaction gains (losses) arising from transactions denominated in foreign currencies | $ (1,000,000.0) | $ 4,700,000 | $ (7,000,000.0)
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 |
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 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 | $ 2,900,000 | $ 2,300,000 | $ 3,000,000.0
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% |  |
Software Development |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 3 years |  |

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