Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 47,667	$ 30,809
Accumulated depreciation	(22,264)	(15,613)
Property and equipment, net	25,403	15,196
Purchased software
Property, Plant and Equipment [Line Items]
Gross property and equipment	1,706	1,651
Computer equipment and network hardware
Property, Plant and Equipment [Line Items]
Gross property and equipment	40,765	24,673
Furniture, fixtures and office equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	1,959	1,491
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 3,237	$ 2,994