Property and Equipment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property and equipment
Property and equipment, gross	$ 9,978,000		$ 9,978,000		$ 8,738,000
Less accumulated depreciation and amortization	(6,768,000)		(6,768,000)		(6,290,000)
Property and equipment, net	3,210,000		3,210,000		2,448,000
Depreciation and amortization expense	162,000	$ 184,000	478,000	$ 529,000
Computer Equipment
Property and equipment
Property and equipment, gross	1,039,000		1,039,000		862,000
Software
Property and equipment
Property and equipment, gross	663,000		663,000		254,000
Lab Equipment and Furniture
Property and equipment
Property and equipment, gross	5,634,000		5,634,000		5,194,000
Leasehold Improvements
Property and equipment
Property and equipment, gross	$ 2,642,000		$ 2,642,000		$ 2,428,000