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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer shares | Dec. 31, 2016 USD ($) Customer shares | Dec. 31, 2015 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated salvage value | 70.00% |  |
Capitalized software development costs, net | $ 2,499,000 | $ 8,497,000 |
Capitalized computer software, amortization | 6,000,000 | 7,400,000 | $ 7,200,000
Additions to capitalized software development costs | $ 0 | 0 | 9,600,000
Variance below minimum VSOE rate | 10.00% |  |
Advertising costs | $ 5,700,000 | 1,300,000 | 500,000
Prepaid advertising costs | $ 0 | $ 0 |
Common stock, conversion ratio | One |  |
Preferred stock, shares outstanding | shares | 0 | 0 |
Reclassification of foreign currency translation adjustment from other comprehensive income | $ 0 | $ 0 | 280,000
Cumulative foreign currency translation amount | (6,000,000) | (10,800,000) | (7,400,000)
Foreign currency translation adjustments, tax | 0 | 0 | 0
Transaction gains (losses) arising from transactions denominated in foreign currencies | $ (7,000,000) | $ 3,000,000 | $ 2,400,000
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 |
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 |  |
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 |  |
Software Development |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 3 years |  |

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