Restructuring Charges - Components of Charges Included in Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring and Other Charges
Non-cash inventory write-downs	$ 2,515	$ 4,103
Restructuring and Related Cost, Incurred Cost	4,745	5,394	$ 0
Restructuring and other charges
Restructuring and Other Charges
Retention and severance benefits	3,135	0
Non-cash inventory write-downs	1,000	4,103
Employee termination benefits	610	1,291
Restructuring and Related Cost, Incurred Cost	$ 4,745	$ 5,394