Significant Customer and Geographic Information (Long-lived assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of long-lived assets by geographical area
Long-lived assets	$ 10,475	$ 18,312
United States [Member]
Schedule of long-lived assets by geographical area
Long-lived assets	10,475	16,189
Europe [Member]
Schedule of long-lived assets by geographical area
Long-lived assets	0	2,123
Asia [Member]
Schedule of long-lived assets by geographical area
Long-lived assets	$ 0	$ 0