Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended		33 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Property and equipment
Less: accumulated depreciation		$ (688)	$ (93)	$ (688)
Property and equipment, net		880	756	880
Depreciation and amortization expense	0	231	93	324
Impairment losses		364		364
Laboratory equipment
Property and equipment
Property and equipment, gross		1,377	663	1,377
Impairment losses		400
Furniture
Property and equipment
Property and equipment, gross		106	101	106
Computer equipment
Property and equipment
Property and equipment, gross		7	7	7
Leasehold improvements
Property and equipment
Property and equipment, gross		$ 78	$ 78	$ 78