Business Segment and Geographic Data, Revenue by Geographical Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Net revenues by geographic area [Abstract]
Revenues	$ 58,065		$ 58,906		$ 115,281		$ 109,179
Long-lived assets by geographic area [Abstract]
Long-lived assets	8,857				8,857				6,759
North America [Member]
Net revenues by geographic area [Abstract]
Revenues	42,033	[1]	43,948	[1]	86,932	[1]	82,636	[1]
Long-lived assets by geographic area [Abstract]
Long-lived assets	7,660				7,660				5,772
Asia Pacific [Member]
Net revenues by geographic area [Abstract]
Revenues	9,440	[2]	8,466	[2]	15,202	[2]	13,773	[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	5,861		6,245		11,494		11,453
Long-lived assets by geographic area [Abstract]
Long-lived assets	1,197				1,197				987
South America [Member]
Net revenues by geographic area [Abstract]
Revenues	731		247		1,653		1,317
Long-lived assets by geographic area [Abstract]
Long-lived assets	0				0				0
United States [Member]
Net revenues by geographic area [Abstract]
Revenues	37,329		37,470		75,336		70,093
Japan [Member]
Net revenues by geographic area [Abstract]
Revenues	$ 7,452		$ 6,847		$ 11,715		$ 10,174

[1] United States $ 37,329 $ 37,470 $ 75,336 $ 70,093

[2] Japan $ 7,452 $ 6,847 $ 11,715 $ 10,174