Restructuring Charges (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2015 employee	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 96	$ 1,211
Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee	40
Number of positions expected to be eliminated (percent)	7.00%
Restructuring charges		100		$ 4,200
Expected cost remaining		100		100
Restructuring Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Reduction in net operating expenses		14,000		14,000
Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Reduction in net operating expenses		$ 18,000		$ 18,000