Fixed Assets - Schedule of Fixed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,025	$ 11,012
Less: accumulated depreciation	(8,666)	(6,733)
Fixed assets, net of accumulated depreciation and amortization	5,359	4,279
Computer equipment and software, office equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,513	9,887
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	$ 2,512	$ 1,125
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	4 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	12 years