Breakdown of Revenue and Non-Current Assets by Geographical Areas - Other Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	$ 131,525	$ 98,952
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	43,308	24,437
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	42,474	23,332
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	7,132	8,847
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	26,033	17,508
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	8,965	7,807
Holding
Revenues from External Customers and Long-Lived Assets [Line Items]
Non-current assets	$ 55,052	$ 48,160