Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property and equipment
Property and equipment, gross	$ 8,620,000		$ 8,620,000		$ 8,145,000
Less accumulated depreciation and amortization	(6,120,000)		(6,120,000)		(5,591,000)
Property and equipment, net	2,500,000		2,500,000		2,554,000
Depreciation expense	184,000	143,000	529,000	355,000
Computer Equipment
Property and equipment
Property and equipment, gross	858,000		858,000		798,000
Software
Property and equipment
Property and equipment, gross	225,000		225,000		209,000
Lab Equipment and Furniture
Property and equipment
Property and equipment, gross	5,114,000		5,114,000		4,809,000
Leasehold Improvements
Property and equipment
Property and equipment, gross	$ 2,423,000		$ 2,423,000		$ 2,329,000