Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 33	$ 126		$ 32	$ 216		$ 216
Payments/Settlements	33	93		32	303	$ 126	335
Charges			$ 126		119	126	119
Payments/Settlements	(33)	(93)		(32)	(303)	(126)	(335)
Balance at end of period		33	126		32
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	33	126		14	190		190
Payments/Settlements	33	93		14	295	126	309
Charges			126		119	126	119
Payments/Settlements	$ (33)	(93)		(14)	(295)	$ (126)	(309)
Balance at end of period		$ 33	$ 126		14
Facility Costs And Contract Termination [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period				18	26		26
Payments/Settlements				(18)	(8)		(26)
Payments/Settlements				$ 18	8		$ 26
Balance at end of period					$ 18