Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property and Equipment
Property and equipment, gross	$ 21,878		$ 21,878		$ 22,029
Less accumulated depreciation and amortization	(20,614)		(20,614)		(20,476)
Property and equipment, net	1,264		1,264		1,553
Depreciation and amortization	100	100	337	225
Equipment [Member]
Property and Equipment
Property and equipment, gross	12,667		12,667		12,681
Leasehold Improvements [Member]
Property and Equipment
Property and equipment, gross	4,958		4,958		4,958
Computers And Software [Member]
Property and Equipment
Property and equipment, gross	3,083		3,083		3,220
Furniture And Fixtures [Member]
Property and Equipment
Property and equipment, gross	$ 1,170		$ 1,170		$ 1,170