Restructuring (Textual) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended						3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Q1 2012 Restructuring Plan [Member]	Dec. 31, 2012 Q1 2012 Restructuring Plan [Member] employee	Sep. 30, 2012 Q3 2012 Restructuring Plan [Member] employee	Dec. 31, 2013 Q3 2012 Restructuring Plan [Member]	Dec. 31, 2012 Q3 2012 Restructuring Plan [Member]	Dec. 31, 2013 Q4 2013 Restructuring Plan [Member] employee	Dec. 31, 2013 Q4 2013 Restructuring Plan [Member]	Dec. 31, 2012 Q4 2013 Restructuring Plan [Member]	Dec. 31, 2012 Employee Severance [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2012 Facility Closing [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2012 Leasehold Improvement Write Down [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2012 Equipment Disposal Charges [Member] Q3 2012 Restructuring Plan [Member]	Sep. 30, 2012 Research and Development Functions [Member] Q3 2012 Restructuring Plan [Member] employee	Sep. 30, 2012 General and Administrative Functions [Member] Q3 2012 Restructuring Plan [Member] employee	Dec. 31, 2012 Selling, General and Administrative [Member] Q1 2012 Restructuring Plan [Member]	Dec. 31, 2012 Selling, General and Administrative [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2013 Selling, General and Administrative [Member] Q4 2013 Restructuring Plan [Member]	Dec. 31, 2012 Research and Development [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2013 Research and Development [Member] Q4 2013 Restructuring Plan [Member]	Dec. 31, 2012 Accrued Compensation [Member] Q3 2012 Restructuring Plan [Member]	Dec. 31, 2012 Accrued Expenses [Member] Q3 2012 Restructuring Plan [Member]
Restructuring (Textual) [Abstract]
Number of positions eliminated (employee)				13	173			15							150	23
Restructuring charges adjusted							$ 2,418				$ 684		$ 1,071				$ 572			$ 948
Restructuring charges	809	3,109	0	572			2,537		809	0		320		342				1,470	236		573
Cash payments	877	1,123	0	512		345	611		532	0
Adjustment to previously accrued charges	26	153	0	60		26	93		0	0
Restructuring reserve	$ 277	$ 420	$ 0	$ 0		$ 0	$ 420	$ 277	$ 277	$ 0												$ 68	$ 352