Property and Equipment, net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property and equipment, net [Abstract]
Property and equipment, gross	$ 5,902		$ 5,704
Accumulated depreciation and amortization	(4,596)		(4,292)
Property and equipment, net	1,306		1,412
Depreciation and related amortization expense	157	$ 196
Equipment, Computer Hardware and Software [Member]
Property and equipment, net [Abstract]
Property and equipment, gross	5,030		4,817
Furniture and Fixtures [Member]
Property and equipment, net [Abstract]
Property and equipment, gross	426		442
Leasehold Improvements [Member]
Property and equipment, net [Abstract]
Property and equipment, gross	$ 446		$ 445