Property and Equipment, net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,106		$ 1,061
Less: Accumulated depreciation	(548)		(447)
Net property and equipment	558		614
Depreciation	101	$ 100
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