Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property and Equipment
Total property and equipment	$ 2,373	$ 793
Less: accumulated depreciation	(300)	(89)
Property and equipment, net	2,073	704
Depreciation expense	211	83
Leasehold Improvements
Property and Equipment
Total property and equipment	1,268
Laboratory equipment
Property and Equipment
Total property and equipment	518	504
Computer equipment
Property and Equipment
Total property and equipment	303	173
Furniture And Fixtures
Property and Equipment
Total property and equipment	$ 284	$ 116