Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Net revenues by geographic area [Abstract]
Revenues	$ 53,703		$ 45,893		$ 155,898		$ 161,174
Reportable Geographical Components [Member]
Net revenues by geographic area [Abstract]
Revenues	53,703		45,893		155,898		161,174
Long-lived assets by geographic area [Abstract]
Long-lived assets	28,849				28,849				10,489
Reportable Geographical Components [Member] | North America [Member]
Net revenues by geographic area [Abstract]
Revenues	43,792	[1]	35,239	[1]	125,568	[1]	122,170	[1]
Long-lived assets by geographic area [Abstract]
Long-lived assets	27,399				27,399				9,119
Reportable Geographical Components [Member] | Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues	2,248	[2]	1,778	[2]	7,263	[2]	16,980	[2]
Long-lived assets by geographic area [Abstract]
Long-lived assets	249				249				0
Reportable Geographical Components [Member] | Europe (Including Israel) [Member]
Net revenues by geographic area [Abstract]
Revenues	7,423		8,083		21,915		19,577
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,197				1,197				1,370
Reportable Geographical Components [Member] | South America [Member]
Net revenues by geographic area [Abstract]
Revenues	240		793		1,152		2,447
Long-lived assets by geographic area [Abstract]
Long-lived assets	4				4				0
Reportable Geographical Components [Member] | United States [Member]
Net revenues by geographic area [Abstract]
Revenues	41,338		30,287		114,718		98,832
Reportable Geographical Components [Member] | Canada [Member]
Net revenues by geographic area [Abstract]
Revenues	2,454		4,952		10,850		23,338
Reportable Geographical Components [Member] | Japan [Member]
Net revenues by geographic area [Abstract]
Revenues	$ 435		$ 205		$ 1,423		$ 11,455

[1] United States $41,338 $30,287 $114,718 $98,832 1 Canada $2,454 $4,952 $10,850 $23,338

[2] Japan $435 $205 $1,423 $11,455