Property and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 1.0	$ 0.7	$ 2.1	$ 1.1
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			5 years
Office and Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			3 years
Office and Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			5 years
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			1 year
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment			3 years