Property and Equipment, Net - Property and Equipment under Capital Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 18,501	$ 13,000
Less accumulated depreciation and amortization	(9,047)	(4,959)
Property and equipment under capital leases, net	9,454	8,041
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	13,655	8,729
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	1,250	1,250
Computer Hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	2,846	2,454
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	651	523
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 99	$ 44