Fixed Assets - Schedule of Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 26,318	$ 20,891
Less: accumulated depreciation	(17,537)	(12,944)
Property, plant and equipment, net	8,781	7,947
Computer equipment and software, office equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 22,631	19,265
Computer equipment and software, office equipment and furniture | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Computer equipment and software, office equipment and furniture | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,687	$ 1,626
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	6 years