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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 USD ($) Customer shares | Sep. 30, 2018 | Dec. 31, 2018 USD ($) Customer shares | Dec. 31, 2017 USD ($) Customer shares | Dec. 31, 2016 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Capitalized software development costs, net | $ 0 |  | $ 0 | $ 2,499,000 |
Capitalized computer software, amortization |  |  | 2,500,000 | 6,000,000 | $ 7,400,000
Additions to capitalized software development costs |  |  | $ 0 | 0 | 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 |  | 3 years |  |
Product support period |  |  | 1 year |  |
Capitalized cost to obtain customer contracts net | $ 4,200,000 |  | $ 4,200,000 | 4,500,000 |
Advertising costs |  |  | 7,100,000 | 5,700,000 | 1,300,000
Prepaid advertising costs | $ 0 |  | $ 0 | $ 0 |
Common stock, conversion ratio |  |  | One |  |
Preferred stock, shares outstanding | shares | 0 |  | 0 | 0 |
Cumulative foreign currency translation amount | $ (9,800,000) |  | $ (9,800,000) | $ (5,700,000) | (11,000,000)
Foreign currency translation adjustments, tax |  |  | 0 | 0 | 0
Transaction gains (losses) arising from transactions denominated in foreign currencies |  |  | $ 4,700,000 | $ (7,000,000) | $ 3,000,000
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 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 |  |  | $ 2,300,000 | $ 3,000,000 | $ 2,700,000
Computer Equipment And Purchased Software |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives of assets, years |  |  | 3 years |  |
Office Equipment And Automobiles |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives of assets, years |  |  | 5 years |  |
Office Furniture And Corporate Aircraft |  |  |  |  |
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 | 10 years |  |  |
Estimated salvage value | 21.00% | 70.00% | 21.00% |  |
Software Development |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful lives of assets, years |  |  | 3 years |  |

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