Restructuring Charges - Facilities Restructuring Initiative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2014 sqft	Jan. 23, 2014 sqft
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100	$ 100	$ 400	$ 692	$ 1,728	$ 0
Facilities Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve				3	0
Restructuring charges				663
Payments for Restructuring				$ 660
Approximate square footage of manufacturing and office space							47,000	21,300