Segment Reporting - PPE (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 5,640	$ 5,447
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	5,423	4,938
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	166	408
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 51	$ 101