Fixed Assets - Schedule of Fixed Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	$ (972)	$ (151)
Total	10,356	6,252
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	913	518
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,620	1,005
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 8,795	$ 4,880