Property and Equipment, net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,106	$ 1,061
Less: Accumulated depreciation	(505)	(447)
Net property and equipment	601	614
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	329	329
Office and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	301	256
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	425	425
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 51	$ 51