Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended														12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenues by geographic area [Abstract]
Revenues	$ 38,878	$ 35,611	[1]	$ 38,977	[1]	$ 50,075	$ 63,490	$ 45,893	$ 58,065	$ 57,216	$ 54,791	$ 56,681	$ 58,906	$ 50,273	$ 163,541	$ 224,664	$ 220,651
Long-lived assets by geographic area [Abstract]
Long-lived assets	13,802						10,489				6,759				13,802	10,489	6,759
Reportable Geographical Components [Member] | North America [Member]
Net revenues by geographic area [Abstract]
Revenues															123,161	174,850	163,973
Long-lived assets by geographic area [Abstract]
Long-lived assets	12,385						9,119				5,772				12,385	9,119	5,772
Reportable Geographical Components [Member] | Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues															9,870	19,081	28,031
Long-lived assets by geographic area [Abstract]
Long-lived assets	286						0				0				286	0	0
Reportable Geographical Components [Member] | Europe (Including Israel) [Member]
Net revenues by geographic area [Abstract]
Revenues															29,227	27,849	25,521
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,127						1,370				987				1,127	1,370	987
Reportable Geographical Components [Member] | South America [Member]
Net revenues by geographic area [Abstract]
Revenues															1,283	2,884	3,126
Long-lived assets by geographic area [Abstract]
Long-lived assets	4						0				0				4	0	0
Reportable Geographical Components [Member] | United States [Member]
Net revenues by geographic area [Abstract]
Revenues															109,203	149,713	135,950
Reportable Geographical Components [Member] | Canada [Member]
Net revenues by geographic area [Abstract]
Revenues															13,953	25,137	28,023
Reportable Geographical Components [Member] | Japan [Member]
Net revenues by geographic area [Abstract]
Revenues															$ 1,750	$ 12,226	$ 21,134

[1] The information has been retroactively adjusted to account for the LCA business which is classified as held for sale as of December 31, 2014, as a discontinued operations.