Derivative Financial Instruments	9 Months Ended
Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	12. Derivative Financial Instruments The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by using derivative instruments is foreign currency exchange rate risk. The Company has entered into certain financial derivative instruments to manage this risk. The derivative financial instruments the Company has entered into are forward exchange contracts which have terms of less than one year to economically hedge foreign currency exchange rate risk on recognized non-functional currency monetary accounts. The purpose of the Company’s foreign currency economic hedging activities is to economically hedge the Company’s risk from changes in the fair value of non-functional currency denominated monetary accounts. The Company records all derivative financial instruments at their fair value in its consolidated balance sheets. None of the derivative financial instruments that the Company holds are designated as either a fair value hedge or cash flow hedge and the gain or loss on the derivative instrument is recorded in earnings. The Company has determined that the fair value of its derivative financial instruments are computed using level 2 inputs (inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability) in the fair value hierarchy as the fair value is based on publicly available foreign exchange rates at each financial reporting date. As of September 30, 2018, and December 31, 2017, the fair value of the Company’s foreign currency forward contracts totaled an asset of less than $1 million, respectively, and is included in prepaid and other current assets in the consolidated balance sheets; a liability of less than $1 million, respectively, and is included in other current liabilities in the consolidated balance sheets. For the three and nine months ended September 30, 2018, the Company recorded a gain of less than $1 million and a loss of $1 million, respectively, related to changes in fair value. For the three and nine months ended September 30, 2017, the Company recorded a gain of less than $1 million and $2 million, respectively, related to the changes in fair value. All gains and losses are included in other expense in the consolidated statements of operations. The notional principal associated with those contracts was $24 million and $37 million as of September 30, 2018 and December 31, 2017, respectively. As of September 30, 2018, the Company’s financial instruments do not contain any credit-risk-related or other contingent features that could cause accelerated payments when the Company’s financial instruments are in net liability positions. The Company does not use derivative financial instruments for trading or speculative purposes.

12. Derivative Financial Instruments

The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by using derivative instruments is foreign currency exchange rate risk. The Company has entered into certain financial derivative instruments to manage this risk.

The derivative financial instruments the Company has entered into are forward exchange contracts which have terms of less than one year to economically hedge foreign currency exchange rate risk on recognized non-functional currency monetary accounts. The purpose of the Company’s foreign currency economic hedging activities is to economically hedge the Company’s risk from changes in the fair value of non-functional currency denominated monetary accounts.

The Company records all derivative financial instruments at their fair value in its consolidated balance sheets. None of the derivative financial instruments that the Company holds are designated as either a fair value hedge or cash flow hedge and the gain or loss on the derivative instrument is recorded in earnings. The Company has determined that the fair value of its derivative financial instruments are computed using level 2 inputs (inputs other than quoted prices in active markets for identical assets and liabilities that are observable either directly or indirectly for substantially the full term of the asset or liability) in the fair value hierarchy as the fair value is based on publicly available foreign exchange rates at each financial reporting date. As of September 30, 2018, and December 31,

2017, the fair value of the Company’s foreign currency forward contracts totaled an asset of less than $1 million, respectively, and is included in prepaid and other current assets in the consolidated balance sheets; a liability of less than $1 million, respectively, and is included in other current liabilities in the consolidated balance sheets.

For the three and nine months ended September 30, 2018, the Company recorded a gain of less than $1 million and a loss of $1 million, respectively, related to changes in fair value. For the three and nine months ended September 30, 2017, the Company recorded a gain of less than $1 million and $2 million, respectively, related to the changes in fair value. All gains and losses are included in other expense in the consolidated statements of operations. The notional principal associated with those contracts was $24 million and $37 million as of September 30, 2018 and December 31, 2017, respectively.

As of September 30, 2018, the Company’s financial instruments do not contain any credit-risk-related or other contingent features that could cause accelerated payments when the Company’s financial instruments are in net liability positions. The Company does not use derivative financial instruments for trading or speculative purposes.