Commitments and Contingencies	9 Months Ended
Sep. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(5) Commitments and Contingencies (a) Commitments From time to time, the Company enters into certain types of contracts that require it to indemnify parties against third-party claims. These contracts primarily relate to agreements under which the Company assumes indemnity obligations for intellectual property infringement, as well as other obligations from time to time depending on arrangements negotiated with customers and other third parties. The conditions of these obligations vary. Thus, the overall maximum amount of the Company’s indemnification obligations cannot be reasonably estimated. Historically, the Company has not been obligated to make significant payments for these obligations and does not currently expect to incur any material obligations in the future. Accordingly, the Company has not recorded an indemnification liability on its balance sheets as of September 30, 2018 or December 31, 2017. The Company leases office space under operating lease agreements. Under the lease agreements, in addition to base rent, the Company is generally responsible for certain taxes, utilities and maintenance costs, and other fees. Several of these leases include options for renewal. The Company does not have any material capital leases. The Company leases approximately 214,000 square feet of office space at a location in Northern Virginia that began serving as its corporate headquarters in October 2010. In January 2018, the Company amended the lease to extend the lease term through December 2030. The amended lease also provides for certain tenant allowances and incentives. At September 30, 2018 and December 31, 2017, deferred rent of $27.1 million and $8.5 million, respectively, was included in other long-term liabilities. As a result of the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), the Company estimated and recorded a one-time $40.3 million tax expense related to the mandatory deemed repatriation transition tax (“Transition Tax”) during the year ended December 31, 2017. The Company subsequently recorded a measurement-period adjustment to reduce the Transition Tax by $3.1 million during the three months ended September 30, 2018. At September 30, 2018, $28.9 million of the Transition Tax was unpaid and was included in “Other long-term liabilities.” (b) Contingencies Following an internal review, the Company believes that its Brazilian subsidiary failed or likely failed to comply with local procurement regulations in conducting business with certain Brazilian government entities. While the Company believes that it is probable that the resolution of this matter will result in a loss, the amount or range of loss is not reasonably estimable at this time. Given the early state of the matter, no assurance can be given that the outcome will not result in a material impact on the Company’s earnings and financial results for the period in which any such liability is accrued. However, the Company believes that the outcome of this matter will not have a material effect on the Company’s financial position. The Company is also involved in various legal proceedings arising in the normal course of business. Although the outcomes of these legal proceedings are inherently difficult to predict, management does not expect the resolution of these legal proceedings to have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company has contingent liabilities that, in management’s judgment, are not probable of assertion. If such unasserted contingent liabilities were to be asserted, or become probable of assertion, the Company may be required to record significant expenses and liabilities in the period in which these liabilities are asserted or become probable of assertion.

(5) Commitments and Contingencies

(a) Commitments

From time to time, the Company enters into certain types of contracts that require it to indemnify parties against third-party claims. These contracts primarily relate to agreements under which the Company assumes indemnity obligations for intellectual property infringement, as well as other obligations from time to time depending on arrangements negotiated with customers and other third parties. The conditions of these obligations vary. Thus, the overall maximum amount of the Company’s indemnification obligations cannot be reasonably estimated. Historically, the Company has not been obligated to make significant payments for these obligations and does not currently expect to incur any material obligations in the future. Accordingly, the Company has not recorded an indemnification liability on its balance sheets as of September 30, 2018 or December 31, 2017.

The Company leases office space under operating lease agreements. Under the lease agreements, in addition to base rent, the Company is generally responsible for certain taxes, utilities and maintenance costs, and other fees. Several of these leases include options for renewal. The Company does not have any material capital leases. The Company leases approximately 214,000 square feet of office space at a location in Northern Virginia that began serving as its corporate headquarters in October 2010. In January 2018, the Company amended the lease to extend the lease term through December 2030. The amended lease also provides for certain tenant allowances and incentives. At September 30, 2018 and December 31, 2017, deferred rent of $27.1 million and $8.5 million, respectively, was included in other long-term liabilities.

As a result of the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), the Company estimated and recorded a one-time $40.3 million tax expense related to the mandatory deemed repatriation transition tax (“Transition Tax”) during the year ended December 31, 2017. The Company subsequently recorded a measurement-period adjustment to reduce the Transition Tax by $3.1 million during the three months ended September 30, 2018. At September 30, 2018, $28.9 million of the Transition Tax was unpaid and was included in “Other long-term liabilities.”

(b) Contingencies

Following an internal review, the Company believes that its Brazilian subsidiary failed or likely failed to comply with local procurement regulations in conducting business with certain Brazilian government entities. While the Company believes that it is probable that the resolution of this matter will result in a loss, the amount or range of loss is not reasonably estimable at this time. Given the early state of the matter, no assurance can be given that the outcome will not result in a material impact on the Company’s earnings and financial results for the period in which any such liability is accrued. However, the Company believes that the outcome of this matter will not have a material effect on the Company’s financial position.

The Company is also involved in various legal proceedings arising in the normal course of business. Although the outcomes of these legal proceedings are inherently difficult to predict, management does not expect the resolution of these legal proceedings to have a material adverse effect on the Company’s financial position, results of operations, or cash flows.

The Company has contingent liabilities that, in management’s judgment, are not probable of assertion. If such unasserted contingent liabilities were to be asserted, or become probable of assertion, the Company may be required to record significant expenses and liabilities in the period in which these liabilities are asserted or become probable of assertion.