Property and Equipment, net - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 94	$ 467
Less: Accumulated depreciation	(31)	(20)
Property and equipment, net	63	447
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	0	373
Useful Life (Years)	0 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	13	13
Useful Life (Years)	3 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	69	69
Useful Life (Years)	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 12	$ 12
Useful Life (Years)	5 years