Financial Instruments - Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Not Designated as Hedging Instrument | Foreign Exchange-forward Contracts
Derivatives Fair Value [Line Items]
Foreign currency exchange-forward contracts	[1],[2]	$ 6,000,000	$ 25,000,000

[1] Derivative contracts address foreign currency exchange fluctuations for the Euro versus the U.S. dollar. The Company was entered into two outstanding derivative contracts as of December 31, 2016.

[2] The fair value of our derivatives are not material for all periods presented and are reported as assets in prepaid expenses and other current assets on our consolidated balance sheets. We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.