Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Net revenues by geographic area [Abstract]
Revenues	$ 45,893		$ 56,681		$ 161,174		$ 165,860
Long-lived assets by geographic area [Abstract]
Long-lived assets	10,001				10,001				6,759
North America [Member]
Net revenues by geographic area [Abstract]
Revenues	35,239	[1]	38,888	[1]	122,170	[1]	121,524	[1]
Long-lived assets by geographic area [Abstract]
Long-lived assets	8,701				8,701				5,772
Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues	1,778	[2]	9,533	[2]	16,980	[2]	23,306	[2]
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0
Europe (Including Israel) [Member]
Net revenues by geographic area [Abstract]
Revenues	8,083		7,170		19,577		18,623
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,300				1,300				987
South America [Member]
Net revenues by geographic area [Abstract]
Revenues	793		1,090		2,447		2,407
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0
United States [Member]
Net revenues by geographic area [Abstract]
Revenues	30,287		31,380		98,832		101,473
Japan [Member]
Net revenues by geographic area [Abstract]
Revenues	$ 205		$ 8,144		$ 11,455		$ 18,318

[1] United States $ 30,287 $ 31,380 $ 98,832 $ 101,473

[2] Japan $ 205 $ 8,144 $ 11,455 $ 18,318