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Non-Current Financial Assets	12 Months Ended
Non-Current Financial Assets	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Non-Current Financial Assets	Non-Current Financial Assets Non-current financial assets are mainly composed of (i) an interest-bearing bank deposit amounting to $6.6 million, which is pledged to the benefit of a bank in order to secure the first-demand bank guarantee in connection with our headquarters premises, and (ii) guarantee deposits for office rentals in France, Spain, the United Kingdom, the United States, Japan, China and Singapore.