Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 61,111	$ 34,904
Less accumulated depreciation and amortization	(26,534)	(19,822)
Property and equipment, net	$ 34,577	15,082
Property and equipment, estimated useful life	1 year
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 34,040	19,604
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 9,349	3,541
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	2 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 4,398	1,982
Property and equipment, estimated useful life	7 years
Computer Hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 5,175	4,249
Property and equipment, estimated useful life	3 years
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 7,717	5,033
Computer Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	2 years
Computer Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Assets Not Yet Placed in Service [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 432	$ 495