Financial Instruments - Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments (Details) - USD ($)		Jun. 30, 2017	Dec. 31, 2016
Not Designated as Hedging Instrument | Foreign Exchange-forward Contracts
Derivatives Fair Value [Line Items]
Foreign currency exchange-forward contracts	[1],[2]	$ 5,000,000	$ 6,000,000

[1] Derivative contracts address foreign currency exchange fluctuations for the Euro versus the U.S. Dollar. The Company was entered into one and two outstanding derivative contracts as of June 30, 2017 and December 31, 2016, respectively.

[2] The fair value of our derivatives was not material as of June 30, 2017 and December 31, 2016, respectively. 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